Iconsets

extract the iconsets to /usr/share/gajim/data/iconsets to install them

• balloons
• bubbles
• glass
• Tango
• Pingo
• Lila
• Tango Transports

Warning: If you use SVN version, you should rename all the messages.(gif|png) to event.$1 (since July 13).

Themes

append to your ~/.gajim/config to install them

• black
• emacs
• terminal

Emoticons

extract the emoticons to /usr/share/gajim/data/emoticons or ~/.gajim/emoticons to install them, and restart Gajim

• Google Talk Emoticons
• Kolobok General
• Psynova qip's theme
• Citters Emoticons from Psi
• ICQ6 Emoticons
• Pidgin Emoticons

To learn more about emoticons, have a look at Emoticons

TODO : add screenshot for each theme.