Recreus has recently introduced their Sneakerbot II shoes which they have printed out using their unique Filaflex flexible 3D printer filament. They are also making the 3D model of the shoes available for free for anyone to download on Thingiverse.com.

http://3dprint.com/1540/recreus-intr...flex-filament/

The designer of the Sneakerbot II's got his inspiration for the shoes from futuristic 1980's movies like Back to The Future. Check them out: