The solarized project has a nice iTerm2 color scheme. Anyone know how to make those?
Sure, it's just an XML file with values in it but it's a pain to edit that.
The files are preference lists which can be edited with Xcode (or other preference list editors).
Apart from that, you can simply pick the values in the Preferences » Colors section, then export the theme. Click Load Presets…, then Export.
This has the advantage of being able to see the colors change in real-time.
If you're up for a little programming, somebody created a Groovy script that works in conjunction with Adobe Kuler to generate color schemes: Kuler iTerm2 Themes with Groovy Scripting