A ton of different USB flash drive styles can be found when searching the internet. Most are USB flash drives embedded in to soft teddy bears or in to cars. This latest idea puts the flash drive in to a dog tag. The Olinari Silver USB dog tag is actually a case which holds a Sony Micro Vault Tiny and keeps it safe from getting damaged in your pocket.
Unfortunately Sinlung.com do not mention where these can be found although they do mention other designs are available. Another similar idea can be found over at CrazyAboutGadgets.