Your code doesn't have to look so sour. I've collected a list of Xcode themes (and fonts) a while ago. Many more themes have been submitted in the meanwhile so if you have a theme you'd like to add to the list, just let me know!
Xcode themes
Darkcloud
Dracula
by Zeno Rocha
EGO V2
by Enormego
ElChacho
Flatland
by mduvall
Kelly's
Monokai
Night
Quiet Light
One of the few light themes that made the list.
Railscast
Inspired by the famous Railscast TextMate theme.
Sidewalk Chalk
Solarized Light
Tomorrow
Available for all kind of editors on GitHub.
Tomorrow Dark
Nice dark variant.
Yozora
My absolute favorite!
Fonts
Bitstream Vera Sans (download)
Consolas (instructions to download on Mac)
Courier Prime (download)
Thanks for the tip Damian Carrillo.
Droid Sans Mono (download)
Inconsolata (download)
Menlo
My favorite. Shipped with Mac OS.
Meslo (download)
A great Menlo alternative that comes with three different line height options. Recommended if you prefer a little bit of air between your lines.
Monaco
Great font, also shipped with Mac OS.
Panic Sans (install instructions)
Provided with Coda.
Source Code Pro (download)
Adobe's open source font. Recommended!
Ubuntu Mono (install instructions)
Installation
- Copy the theme(s) to the Xcode's
FontAndColorThemesfolder (~/Library/Developer/Xcode/UserData/FontAndColorThemes/). - Restart Xcode.
- Enjoy.