Eclipse isn't the best when it comes to customizations but with a few tricks we can alleviate some of the issues. One such issue is color themes. There is no easy way to export color settings (for creation of themes) but there are two files that hold the syntax and text editor coloring information.
Eclipse Color Themes (how-to) by Roger Dudler and Felix Dahlke is a better method of importing themes into Eclipse. My method was just a temporary work around until a plug-in was written.
Note: Files from and tested with Eclipse 3.5 (Galileo) using Java
The two main areas that control the IDE's coloring:
Window | Preference | Java | Editor | Syntax Coloring
Window | Preference | General | Editors | Text Editors
These preferences are saved in:
org.eclipse.jdt.ui.prefs = Syntax Coloring
org.eclipse.ui.editors.prefs = Text Editors
So from that one can make, import, and export their preferences easily without editing the files manually.
Here are some themes I've found (and created!)
Default (Originally from Eclipse)
Inkpot (Originally from here)
Vibrant Ink (Originally from here)
Wombat (Originally from here)
Sula (My theme)
Zenburn (Jani Nurminen)
Download all files here