The latest Adium release has a full fledged WebKit driven message view, the first for an IM client I'd imagine. Honoring this, and my own perversions, I have made a Gundam Theme for Adium.

Update: I updated the theme a bit. The "next" time stamps look much nicer.

The default theme is Gundam vs Zaku II:

The main variant is Gundam vs Red Comet:

A lesser variant is Gundam vs Zaku II without icon display.