Wear a robe with ton's of $'s, %'s, and @'s randomly strewn across it. After all isn't Perl just funny symbols? (I like them, but sometimes when I come out with something like (0..$#$path) I realize why they are a mental barrier for many.)

Or get a swiss-army knife costume and glue a chainsaw on.

Hmmm...a few JAPHs would be fun. For instance I have thought for a bit that it would be fun to have a picture of a gun with JAPH at the firing range placed on top of it on a t-shirt.

Tell us what you come up with!