Rated 4 out of 5 stars
In combination with Personas or Themes, the following is useful to change the color of your bookmarks sidebar and bookmarks
Edite your userChrome.css by adding
/* only needed once */ #bookmarks-view treechildren
The 222,218,210 is something you can change depending upon what color you want as a background to your bookmarks.
See, www.tayloredmktg.com/rgb which has a chart of different colors with their three numbers (rgb code).