This is an example box showing four different stylesheets to render the underlying table in different colors. In Mozilla, choose View->Use Stylesheet->[option].

These images were initially created as blue. I used ImageMagick's convert tool to change the hues of them.

Where <x> is between 0 and 200 and represents a percentage change. 100 means no change. Use any GTK (I use gimp's) color circle for reference, less than 100 is counter clockwise, greater than 100 is clockwise.