The Eplain mascot at the top of the Eplain home page was made by Duane Bibby, working with Karl Berry and Steve Peter. It is in the public domain. The fellow's name is TeXimilian, which is a pun on the name of Maximilian I, Holy Roman Emperor who wore a similar hat. Maximilian was a keen supporter of the arts and sciences, and he surrounded himself with scholars, so there are more similarities between TeXimilian and Maximilian than their names and hats. High-resolution drawings of TeXimilian are available in JPEG and TIFF formats.
You can also download Eplain desktop wallpapers created by Steve Peter: