Bike cuffs from Gijs Bakker (Dutch Design God) are on my Christmas list!  So, by the way, is a bike, though apparently ravers are wearing these as arm bands to offset their glow-necklaces. 

Did I mention I was Hermes for Halloween? 

More about Gijs Bakker here: www.gijs-bakker.com
He has been making weird (sometimes functional) jewelry since the late sixties and is one of Holland's major players in design.