I built one, not as bling as those above though, before I could drive I used to bike to work, was only about 1.5 miles but a good flatish run, old bike gave up the ghost so I stripped it and rebuilt it, hope single speed rear hub, xtr bottom bracket, mavic rims and cut all the brake and gear cable guides/mounts off, single speed and no brakes

Could beat my mate to work (in his car) setting off at the same time and he lived further away I can get some pics but its not anything special, but its all DIY so I love it!