Very unusual. I like the idea.
Commissioned bands are delicately hand-engraved with the fingerprint of your partner and therefore completely unique to each couple. Available in 9, 14 & 18ct white/yellow/rose gold and platinum. The bands are available in a number of styles with the fingerprint hand-engraved on either the in or outside of the band. Each set is tailored specifically to the couple's taste.
andrew english :: Wedding Band Collection
(via thorsten van elten’s blog)