I agree with Core77 that guerilla marketers are less than fun, but these ninja star business cards are really cool! Also check out John Park’s post on MAKE about some cool business cards he’s seen at Maker Faire so far. Anybody know how to fold up one of these suckers?

Update: Malachi Brown made this tutorial for this shape from four pieces of paper, and I found this other tutorial that uses two pieces of 2×1 paper.