Colors!
This is the color scheme I am using for my desk setup and I think it looks neat.
Esper
Black
Blue
White
Grey
#000000
#0000FF
#FFFFFF
#808080
(0,0,0)
(0,0,255)
(255,255,255)
(128,128,128)
(0,0%,0%)
(240,100%,50%)
(0,0%,100%)
(0,0%,50%)