Like almost every chat client, Colloquy uses its own format for smileys. There are many more smileys available for Adium than there are in Colloquy format, so I wrote a utility to convert Adium emoticon packages to Colloquy emoticon packages. It’s a Python script, and requires the plistlib module, which means you’ll need Python 2.5 if you’re running it on a Mac or Python 2.6 if you’re not.
Note: plistlib only handles XML-format plists, so if you get parse errors, your Adium smiley pack probably has a binary-format Emoticons.plist (the file inside the pack that describes the provided smileys.) To fix this, use OS X’s plutil tool to rewrite Emoticons.plist:
plutil -convert xml1 smileys.AdiumEmoticonSet/Emoticons.plist