This seems to be a fairly common issue but I could not find any help regarding Ubuntu 12.10 version.
I'm a rookie at Ubuntu but I think that the solutions for the older versions could not be used at Quantal Quetzal.
Am I missing something?
Got it using GNOME Color Chooser!
in Eclipse, go to Window > Preferences. A new window will open. There open the General detail discloser, then open Appearance, click on Colors and Fonts and voila! Change it to your liking.
I'm on a Mac right now, but the window is the same (and please consider this is Android Developer Tools, a eclipse based IDE): !http://s17.postimage.org/w721i79jz/Screen_Shot_2013_02_05_at_10_11_52_PM.png