diff --git a/README.md b/README.md
index 413c97c..9f74e19 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,7 @@ ccbr_tools --help
 
     Commands:
       send-email  Send an email (works on biowulf)
-      quarto-add  Add a quarto extension
+      quarto-add  Add a quarto extension from the CCBR GitHub organization.
       install     Install a specific version of a CCBR software package,...
       cite        Print the citation in the desired format
       version     Print the version of ccbr_tools
diff --git a/src/ccbr_tools/__main__.py b/src/ccbr_tools/__main__.py
index 95e931a..35f67f9 100755
--- a/src/ccbr_tools/__main__.py
+++ b/src/ccbr_tools/__main__.py
@@ -13,7 +13,7 @@
     CustomClickGroup,
 )
 from .send_email import send_email_msg
-from .templates import use_quarto_ext, get_quarto_extensions
+from .templates import use_quarto_ext
 from .software import install as install_software
 
 
@@ -136,7 +136,7 @@ def send_email(to_address, text, subject, attach_html, from_addr, debug):
     send_email_msg(to_address, text, subject, attach_html, from_addr, debug)
 
 
-@click.command(epilog=f"Available extensions: {', '.join(get_quarto_extensions())}")
+@click.command()
 @click.argument(
     "ext_name",
     type=str,
@@ -144,11 +144,13 @@ def send_email(to_address, text, subject, attach_html, from_addr, debug):
 )
 def quarto_add(ext_name):
     """
-    Add a quarto extension
+    Add a quarto extension from the CCBR GitHub organization.
+
+    Runs `quarto use template CCBR/quarto-{ext_name}`.
 
     \b
     Arguments:
-        ext_name    The name of the extension in ccbr_tools
+        ext_name    The name of the extension (e.g. "fnl" for CCBR/quarto-fnl)
 
     \b
     Examples:
diff --git a/src/ccbr_tools/templates/__init__.py b/src/ccbr_tools/templates/__init__.py
index 4161175..a2dec04 100755
--- a/src/ccbr_tools/templates/__init__.py
+++ b/src/ccbr_tools/templates/__init__.py
@@ -13,7 +13,7 @@
 
 Quarto HTML format with FNL branding guidelines
 
-First run `ccbr_tools quarto-add fnl`, then modify your `_quarto.yml` file with the following:
+First run `ccbr_tools quarto-add fnl` (which runs `quarto use template CCBR/quarto-fnl`), then modify your `_quarto.yml` file with the following:
 
 ```yaml
 website:
@@ -30,8 +30,7 @@
 """
 
 import importlib.resources
-import pathlib
-import shutil
+import subprocess
 
 
 def read_template(template_name):
@@ -98,22 +97,20 @@ def get_quarto_extensions():
 
 def use_quarto_ext(ext_name):
     """
-    Use a Quarto extension
+    Use a Quarto extension from the CCBR GitHub organization.
+
+    Runs `quarto use template CCBR/quarto-{ext_name}`.
 
     Args:
-        ext_name (str): The name of the extension in ccbr_tools
+        ext_name (str): The name of the Quarto extension (e.g. "fnl" for CCBR/quarto-fnl).
+
+    Raises:
+        subprocess.CalledProcessError: If the quarto command fails.
 
     Examples:
         >>> use_quarto_ext("fnl")
     """
-    ext_dir = importlib.resources.files(__package__) / "_extensions"
-    template_dir = ext_dir / ext_name
-    if not template_dir.exists() and not (template_dir / "_extension.yml").is_file():
-        raise FileNotFoundError(
-            f"{ext_name} does not exist. Available extensions: {', '.join(get_quarto_extensions())}"
-        )
-    out_dir = pathlib.Path("_extensions")
-    if not out_dir.exists():
-        out_dir.mkdir()
-    shutil.copytree(template_dir, out_dir / ext_name, dirs_exist_ok=True)
-    print(f"Copied {ext_name} to {out_dir}")
+    subprocess.run(
+        ["quarto", "use", "template", f"CCBR/quarto-{ext_name}"],
+        check=True,
+    )
diff --git a/src/ccbr_tools/templates/_extensions/__init__.py b/src/ccbr_tools/templates/_extensions/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/src/ccbr_tools/templates/_extensions/fnl/__init__.py b/src/ccbr_tools/templates/_extensions/fnl/__init__.py
deleted file mode 100644
index 64660e6..0000000
--- a/src/ccbr_tools/templates/_extensions/fnl/__init__.py
+++ /dev/null
@@ -1,18 +0,0 @@
-"""
-Quarto HTML format with FNL branding guidelines
-
-First run `ccbr_tools quarto-add fnl`, then modify the `_quarto.yml` file with the following:
-
-```yaml
-website:
-  ...
-  page-footer:
-    background: black
-    foreground: white
-    center: |
-      Created by the
-      [CCR Collaborative Bioinformatics Resource](https://github.com/CCBR)
-
-format: fnl-html
-```
-"""
diff --git a/src/ccbr_tools/templates/_extensions/fnl/_extension.yml b/src/ccbr_tools/templates/_extensions/fnl/_extension.yml
deleted file mode 100644
index fd0e589..0000000
--- a/src/ccbr_tools/templates/_extensions/fnl/_extension.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-title: fnl
-author: Kelly Sovacool
-version: 0.1.3
-quarto-required: ">=1.5.0"
-contributes:
-  formats:
-    html:
-      theme:
-        dark: [darkly, fnl-dark.scss]
-        light: [flatly, fnl-light.scss]
-      toc: true
-      code-fold: show
-    revealjs:
-      theme: fnl-light-revealjs.scss
diff --git a/src/ccbr_tools/templates/_extensions/fnl/fnl-dark.scss b/src/ccbr_tools/templates/_extensions/fnl/fnl-dark.scss
deleted file mode 100644
index af1ba6e..0000000
--- a/src/ccbr_tools/templates/_extensions/fnl/fnl-dark.scss
+++ /dev/null
@@ -1,51 +0,0 @@
-// override select variables from fnl-light.scss
-/*-- scss:defaults --*/
-
-// branding guidelines
-// https://nih.sharepoint.com/:b:/r/sites/NCI-Fred/Communications/Shared%20Documents/Branding%20guidelines%20LIVE.pdf?csf=1&web=1&e=e9PrVO
-
-// primary colors
-$black: #000000;
-$white: #ffffff;
-$lime: #7cc349;
-$teal: #296b7f;
-
-//secondary colors
-$teal-light: #4e9db5;
-$teal-dark: #19424e;
-$almost-black: #03191f;
-$lime-light: #b1ee85;
-$lime-dark: #528230;
-$orange: #ecba4c;
-
-// set colors
-$primary: $teal;
-$secondary: $lime;
-
-$body-bg: $almost-black;
-$link-color: $lime;
-
-$navbar-bg: $teal-dark;
-$navbar-hl: $lime-light;
-$footer-bg: $black;
-$footer-fg: $white;
-$footer-hl: $lime-light;
-$sidebar-hl: $lime-light;
-
-$code-block-bg-alpha: -0.8;
-$code-bg-alpha: -0.8;
-$code-alpha: 0.9;
-$code-bg: $teal-dark;
-$code-color: $orange;
-
-$callout-color-tip: $lime;
-$callout-color-note: $teal-light;
-$callout-color-caution: $orange;
-$callout-color-warning: $orange;
-
-// font
-$font-family-sans-serif: "Roboto", Helvetica, "Source Sans Pro", sans-serif;
-$font-family-monospace:
-  "Roboto Mono",
-  "Andale Mono" "Source Code Pro",
-  monospace;
diff --git a/src/ccbr_tools/templates/_extensions/fnl/fnl-light-revealjs.scss b/src/ccbr_tools/templates/_extensions/fnl/fnl-light-revealjs.scss
deleted file mode 100644
index 07bd85f..0000000
--- a/src/ccbr_tools/templates/_extensions/fnl/fnl-light-revealjs.scss
+++ /dev/null
@@ -1,153 +0,0 @@
-/*-- scss:defaults --*/
-
-// branding guidelines
-// https://nih.sharepoint.com/:b:/r/sites/NCI-Fred/Communications/Shared%20Documents/Branding%20guidelines%20LIVE.pdf?csf=1&web=1&e=e9PrVO
-
-// primary colors
-$black: #000000;
-$white: #ffffff;
-$lime: #7cc349;
-$teal: #296b7f;
-
-//secondary colors
-$teal-light: #4e9db5;
-$teal-dark: #19424e;
-$almost-black: #03191f;
-$lime-light: #b1ee85;
-$lime-dark: #528230;
-$orange: #ecba4c;
-
-// set colors
-$primary: $teal-dark;
-$secondary: $lime;
-$success: $lime-dark;
-$warning: $orange;
-$info: $teal-light;
-
-$link-color: $teal;
-
-$footer-bg: $black;
-$footer-fg: $white;
-
-$code-color: $lime-dark;
-
-$callout-color-tip: $lime-dark;
-$callout-color-note: $teal-light;
-$callout-color-caution: $orange;
-$callout-color-warning: $orange;
-
-// font
-$font-family-sans-serif: "Roboto", Helvetica, "Source Sans Pro", sans-serif;
-$font-family-monospace:
-  "Roboto Mono",
-  "Andale Mono" "Source Code Pro",
-  monospace;
-
-$presentation-font-size-root: 32px;
-$presentation-heading-color: $teal;
-$body-color: $black;
-
-/*-- scss:rules --*/
-
-.reveal .slide blockquote {
-  border-left: 3px solid $teal !important;
-  padding-left: 0.5em !important;
-}
-
-.reveal .slide-logo {
-  bottom: 10px !important;
-  right: 20px !important;
-  height: 65px !important;
-  width: auto !important;
-  max-width: unset !important;
-  max-height: unset !important;
-  position: fixed;
-}
-
-.reveal .subtitle {
-  color: $presentation-heading-color !important;
-  font-size: $presentation-h3-font-size !important;
-}
-/* can't figure out how to override author class?
-.reveal .author {
-  color: $body-color !important;
-}
-*/
-.reveal .date {
-  color: $body-color !important;
-}
-
-.small-text {
-  font-size: small !important;
-}
-
-.smaller-text {
-  font-size: smaller !important;
-}
-
-.x-small-text {
-  font-size: x-small !important;
-}
-
-.medium-text {
-  font-size: medium !important;
-}
-
-.large-text {
-  font-size: large !important;
-}
-
-.color-muted {
-  color: $text-muted !important;
-}
-
-.big-center {
-  font-size: 60px !important;
-  color: $lime-dark !important;
-  text-align: center !important;
-  vertical-align: middle !important;
-  padding: 200px 0;
-}
-
-.align-center {
-  text-align: center !important;
-}
-
-.align-right {
-  text-align: right !important;
-}
-
-.big-middle {
-  font-size: xxx-large !important;
-  color: $lime-dark !important;
-  vertical-align: middle !important;
-  padding: 70px !important;
-}
-
-.frame-box {
-  border: 3px solid $lime-dark !important;
-  border-radius: 5px !important;
-  padding: 0.5em !important;
-}
-
-.filled-box {
-  border: 5px solid $lime-dark !important;
-  border-radius: 5px !important;
-  padding: 1px !important;
-  background: $lime-dark !important;
-  color: $white !important;
-}
-
-.black-frame {
-  border: 2px solid $black !important;
-  border-radius: 2px !important;
-}
-.narrow-frame {
-  border: 1.5px solid !important;
-  border-radius: 2px !important;
-  //padding: 0.5px !important;
-  text-align: center !important;
-  font-size: large !important;
-  background: #cccccc !important;
-  color: $body-color !important;
-}
diff --git a/src/ccbr_tools/templates/_extensions/fnl/fnl-light.scss b/src/ccbr_tools/templates/_extensions/fnl/fnl-light.scss
deleted file mode 100644
index b93f509..0000000
--- a/src/ccbr_tools/templates/_extensions/fnl/fnl-light.scss
+++ /dev/null
@@ -1,46 +0,0 @@
-/*-- scss:defaults --*/
-
-// branding guidelines
-// https://nih.sharepoint.com/:b:/r/sites/NCI-Fred/Communications/Shared%20Documents/Branding%20guidelines%20LIVE.pdf?csf=1&web=1&e=e9PrVO
-
-// primary colors
-$black: #000000;
-$white: #ffffff;
-$lime: #7cc349;
-$teal: #296b7f;
-
-//secondary colors
-$teal-light: #4e9db5;
-$teal-dark: #19424e;
-$almost-black: #03191f;
-$lime-light: #b1ee85;
-$lime-dark: #528230;
-$orange: #ecba4c;
-
-// set colors
-$primary: $teal-dark;
-$secondary: $lime;
-$success: $lime-dark;
-$warning: $orange;
-$info: $teal-light;
-
-$link-color: $teal;
-
-$footer-bg: $black;
-$footer-fg: $white;
-
-$code-color: $lime-dark;
-
-$callout-color-tip: $lime-dark;
-$callout-color-note: $teal-light;
-$callout-color-caution: $orange;
-$callout-color-warning: $orange;
-
-// font
-$font-family-sans-serif: "Roboto", Helvetica, "Source Sans Pro", sans-serif;
-$font-family-monospace:
-  "Roboto Mono",
-  "Andale Mono" "Source Code Pro",
-  monospace;
-
-/*-- scss:rules --*/
diff --git a/src/ccbr_tools/templates/_extensions/fnl/fnl-logo-dark.png b/src/ccbr_tools/templates/_extensions/fnl/fnl-logo-dark.png
deleted file mode 100644
index d9b9c7c..0000000
Binary files a/src/ccbr_tools/templates/_extensions/fnl/fnl-logo-dark.png and /dev/null differ
diff --git a/src/ccbr_tools/templates/_extensions/fnl/fnl-logo-light.png b/src/ccbr_tools/templates/_extensions/fnl/fnl-logo-light.png
deleted file mode 100644
index d6eb422..0000000
Binary files a/src/ccbr_tools/templates/_extensions/fnl/fnl-logo-light.png and /dev/null differ