improved the default options and instructions on custom/_colors.scss

.themes/classic/sass/custom/_colors.scss

@@ -1,5 +1,6 @@
 // Here you can easily change your sites's color scheme.
 // To give it a try, uncomment some of the lines below rebuild your blog, and see how it works.
+// If you need a handy color picker try http://hslpicker.com
 
 //$header-bg: #263347;
 //$subtitle-color: lighten($header-bg, 58);
@@ -9,5 +10,29 @@
 //$sidebar-link-color-hover: darken(#7ab662, 9);
 
 
-//To use the light Solarized highlighting theme uncomment the following line
+/* To use the light Solarized highlighting theme uncomment the following line */
 //$solarized: light
+
+/* If you want to tweak the Solarized colors you can do that here */
+//$base03:          #002b36; //darkest blue
+//$base02:          #073642; //dark blue
+//$base01:          #586e75; //darkest gray
+//$base00:          #657b83; //dark gray
+//$base0:           #839496; //medium gray
+//$base1:           #93a1a1; //medium light gray
+//$base2:           #eee8d5; //cream
+//$base3:           #fdf6e3; //white
+//$solar-yellow:    #b58900;
+//$solar-orange:    #cb4b16;
+//$solar-red:       #dc322f;
+//$solar-magenta:   #d33682;
+//$solar-violet:    #6c71c4;
+//$solar-blue:      #268bd2;
+//$solar-cyan:      #2aa198;
+//$solar-green:     #859900;
+
+
+/* Non highlighted code colors */
+//$pre-bg: $base03;
+//$pre-border: $base02;
+//$pre-color: $base1;