Custom theme via prelude-theme variable

core/prelude-custom.el

@@ -93,6 +93,11 @@ Only modes that don't derive from `prog-mode' should be listed here."
   :type 'number
   :group 'prelude)
 
+(defcustom prelude-theme 'zenburn
+  "The default color theme, change this in your /personal/preload config."
+  :type 'symbol
+  :group 'prelude)
+
 (provide 'prelude-custom)
 
 ;;; prelude-custom.el ends here

core/prelude-ui.el

@@ -73,7 +73,7 @@
                                           "%b"))))
 
 ;; use zenburn as the default theme
-(load-theme 'zenburn t)
+(load-theme prelude-theme t)
 
 (provide 'prelude-ui)
 ;;; prelude-ui.el ends here