Roller stamps?

[seeinglife.livejournal.com]

I could swear I've seen these before, but I can't find them now. The closest I could find is this. I swear I can remember roller stamp type things that would let you roll out a zigzag line, a line of hearts, etc. Does anyone know what I'm talking about and or where I could find these? I'd particularly love a zigzag one because I want to start making patterns to sell, and one of my pet peeves with commercial patterns is how they never mention how or why or where you're supposed to finish seam edges with an overlock or zigzag stitch. I'd like to roll a zigzag line along where the zigzag stitching should be.