AdiumSkin is a project mainly written in ..., it's free.
A cool varient for the minimalmod skin, made for an IRC use
This skin is another variant for the minimal mod of Adium. I designed it for IRC mostly, it's the minimal mod Balck & Gery but with a nice highlight for IRC mentions :)
Just drag & drop this css file in the /Applications/Adium.app/Contents/Resources/Message Styles/minimal_mod.AdiumMessageStyle/Contents/Resources/Variants folder. Restart and this should works
Xavier Coiffard