Three years ago, while I was in Ghana, I wrote a small screensaver that displays a randomly picked unicode character full-screen. I like it because there is a huge bunch of very weird characters and signs in the unicode standard. It also prints the unicode codepoint and character name.
Now I finally got around to properly package it: Created a small homepage, a source tarball with (hopefully) proper autotool files, all managed in a git repository (also on gitorious), complete with manpage, README and other additional files. I’m also going to upload the package to Debian, so you can just do apt-get install unicode-screensaver as soon as it gets accepted.
It can probably not enter the official xscreensaver distribution as it adds dependencies on the fontconfig and freetype libraries.