Hi, one fun thing I did with Perl was a simple 3-D vector graphics engine. I have it packaged up somewhere if anyone wants it (you probably don't, even if you think you do). I wrote it to teach myself how to do OO in Perl, and was mildly successful.

I have (edit: had. No longer hosted there) a demo on my site at

http://fulcrum.org/cgi-bin/shape_shifter.pl

and

http://fulcrum.org/cgi-bin/letters.pl