While programming or reading code, I like to look at text on a black background, but I want to see particular colors depending on syntax. I created these themes to use with Xcode, TextMate, and Sublime Text.

Xcode 6.x
Cooper.dvtcolortheme.zip - black background with colorful text.

Unzip and place file in:
~/Library/Developer/Xcode/UserData/FontAndColorThemes/

(you may need to create these directories if they do not exist...)

TextMate 2.x
Cooper.tmbundle.zip - black background with colorful text.
Cooper Print.tmbundle.zip - white background with colorful text.

Unzip and double click the bundles. TextMate will finish installation.

Sublime Text 3.x
Cooper.sublime.zip - black background with colorful text and user preferences.

Unzip and place files in:
~/Library/Application Support/Sublime Text 3/Packages/User/

Example
Screenshot of a C language file in Xcode: