Nice.
lol "ph" is my thing too

Free Graffiti fonts:

http://www.dafont.com/graffogie.font
http://www.dafont.com/subway.font
http://www.dafont.com/amezes-font.font
http://www.dafont.com/writers.font
http://www.dafont.com/graffd-out.font

Once downloaded and placed into your fonts app, go to Adium Preferences
then go to the "Appearance" tab
and beside "list layout" on the far right is a customize button, click it.
you can set a font for usernames there
To change the Group font go to the next tab over labeled "Groups"

Hope I've helped :)