Har har, I'm so goth I have a fishnet photoshop brush pack...
A selection of fishnet brushes - ripped, un-ripped, and with varying degrees of stretched-ness. (They were really fun to make - I spent an evening stretching pairs of tights and gloves over things and scanning them to make brushes out of. And I've given them a few test-runs, and they seem to work pretty well for quickly giving the characters in my pictures realistic fishnet textures on their clothes.)
These brushes were made with (and for) Photoshop 7, but they may work with other versions. Free for non-commercial use, but please credit and link back!
thx