I drew these 50x50 bitmaps myself for various occasions; I still use most of them on my desktop. Copy and edit them if you like.
Kassandra, the Trojan seer. (There is a host named kassandra.cs.tu-berlin.de.)
A tub. (Another (ex-)host, and acronym of Techische Universität Berlin.)
Apologies to the late, great Keith Haring. /dev/console.
Elm, the mail frontend. I have no idea what an elm tree really looks like.
News. (After the newspaper I read, die tageszeitung.) A nerd.
Goldie. A baby gargoyle from Neil Gaiman's Sandman cartoon series.