Limechat-solarized-theme is a project mainly written in COFFEESCRIPT and JAVASCRIPT, it's free.
A limechat theme based on the solarized color scheme by Ethan Schoonover
A limechat theme based on the solarized color scheme: http://ethanschoonover.com/solarized
Put the .js, .yaml, and *.css files in ~/Library/Application\ Support/LimeChat/Themes
The dark variation is almost complete, but the light variation still needs work.
Special feature: click the topic bar in a channel to toggle channel events