I think these Harry Winston butterfly-inspired watches from their Premier Precious Butterfly Collection are pretty amazing.
The watches have a butterfly wing dial, and the dials are made from the actual iridescent powder found on real butterfly wings. The designers at Harry Winston have used a technique to harvest the iridescent pigments and use it in the designs to give an eerily real representation of a butterfly wing. Apparently the technique took three years to perfect, and just as in nature, no two of the limited edition watches are the same. Fifty seven diamonds decorate the 2.47 bezel case, and the watch-straps are 18 carat white gold and satin.