I've been dithering of this Utopiary set of stamps from Inkadinkadoo for ages, but finally gave in an bought them from eBay with some of my birthday money.There are 5 silhouette stamps in the set - I tried stamping them in black Memento ink first for these ATC's, but I'm going to experiment with other colours later on!
PS These are available to swap over on the Docrafts site