Port of the Solarized colour scheme for Xcode 4
Repo at https://github.com/mbaltaks/xcode4-solarized, main repo at https://github.com/altercation/solarized.
Use the install-to-xcode script to copy the theme files to the correct place, after which you may have to close and open Xcode.