I'm going through a colour phase at the moment. Maybe next week I'll hit a monochrome streak, but for now, I want bright, pretty, vivid colours. GlassGlam sells postage stamp necklaces that fit the bill:
GlassGlam has several other items in her shop that made me go "ooh!". I like the stamps, though. I don't get to see a lot of pretty stamps nowadays, what with everything being emailed. So thank you, GlassGlam (her real name is Dionea), for making me consider the little stamp again.