Make the default theme color-customizable.

sphinx/themes/default/static/default.css_t

@@ -8,16 +8,16 @@
 /* -- page layout ----------------------------------------------------------- */
 
 body {
-    font-family: sans-serif;
+    font-family: {{ theme_bodyfont }};
     font-size: 100%;
-    background-color: #11303d;
+    background-color: {{ theme_footerbgcolor }};
     color: #000;
     margin: 0;
     padding: 0;
 }
 
 div.document {
-    background-color: #1c4e63;
+    background-color: {{ theme_sidebarbgcolor }};
 }
 
 div.body {
@@ -26,7 +26,7 @@ div.body {
 }
 
 div.footer {
-    color: #fff;
+    color: {{ theme_footertextcolor }};
     width: 100%;
     padding: 9px 0 9px 0;
     text-align: center;
@@ -34,23 +34,23 @@ div.footer {
 }
 
 div.footer a {
-    color: #fff;
+    color: {{ theme_footertextcolor }};
     text-decoration: underline;
 }
 
 div.related {
-    background-color: #133f52;
+    background-color: {{ theme_relbarbgcolor }};
     line-height: 30px;
-    color: #fff;
+    color: {{ theme_relbartextcolor }};
 }
 
 div.related a {
-    color: white;
+    color: {{ theme_relbarlinkcolor }};
 }
 
 div.sphinxsidebar h3 {
-    font-family: 'Trebuchet MS', sans-serif;
-    color: white;
+    font-family: {{ theme_headfont }};
+    color: {{ theme_sidebartextcolor }};
     font-size: 1.4em;
     font-weight: normal;
     margin: 0;
@@ -58,12 +58,12 @@ div.sphinxsidebar h3 {
 }
 
 div.sphinxsidebar h3 a {
-    color: white;
+    color: {{ theme_sidebartextcolor }};
 }
 
 div.sphinxsidebar h4 {
-    font-family: 'Trebuchet MS', sans-serif;
-    color: white;
+    font-family: {{ theme_headfont }};
+    color: {{ theme_sidebartextcolor }};
     font-size: 1.3em;
     font-weight: normal;
     margin: 5px 0 0 0;
@@ -71,7 +71,7 @@ div.sphinxsidebar h4 {
 }
 
 div.sphinxsidebar p {
-    color: white;
+    color: {{ theme_sidebartextcolor }};
 }
 
 div.sphinxsidebar p.topless {
@@ -81,15 +81,15 @@ div.sphinxsidebar p.topless {
 div.sphinxsidebar ul {
     margin: 10px;
     padding: 0;
-    color: white;
+    color: {{ theme_sidebartextcolor }};
 }
 
 div.sphinxsidebar a {
-    color: #98dbcc;
+    color: {{ theme_sidebarlinkcolor }};
 }
 
 div.sphinxsidebar input {
-    border: 1px solid #98dbcc;
+    border: 1px solid {{ theme_sidebarlinkcolor }};
     font-family: sans-serif;
     font-size: 1em;
 }
@@ -97,7 +97,7 @@ div.sphinxsidebar input {
 /* -- body styles ----------------------------------------------------------- */
 
 a {
-    color: #355f7c;
+    color: {{ theme_linkcolor }};
     text-decoration: none;
 }
 
@@ -116,10 +116,10 @@ div.body h3,
 div.body h4,
 div.body h5,
 div.body h6 {
-    font-family: 'Trebuchet MS', sans-serif;
+    font-family: {{ theme_headfont }};
     background-color: #f2f2f2;
     font-weight: normal;
-    color: #20435c;
+    color: {{ theme_headcolor }};
     border-bottom: 1px solid #ccc;
     margin: 20px -20px 10px -20px;
     padding: 3px 0 3px 10px;
@@ -182,8 +182,8 @@ p.admonition-title:after {
 
 pre {
     padding: 5px;
-    background-color: #efc;
-    color: #333;
+    background-color: {{ theme_codebgcolor }};
+    color: {{ theme_codecolor }};
     line-height: 120%;
     border: 1px solid #ac9;
     border-left: none;

sphinx/themes/default/theme.conf

@@ -6,3 +6,19 @@ pygments_style = sphinx
 [options]
 rightsidebar = false
 stickysidebar = false
+
+footerbgcolor    = #11303d
+footertextcolor  = #ffffff
+sidebarbgcolor   = #1c4e63
+sidebartextcolor = #ffffff
+sidebarlinkcolor = #98dbcc
+relbarbgcolor    = #133f52
+relbartextcolor  = #ffffff
+relbarlinkcolor  = #ffffff
+headcolor        = #20435c
+linkcolor        = #355f7c
+codebgcolor      = #eeffcc
+codecolor        = #333333
+
+bodyfont = sans-serif
+headfont = 'Trebuchet MS', sans-serif