There are a TON of decent tutorials for building bike lights. But...how can I put this gently...they are not all equally attractive. If you showed me two lights side by side and they had equal performance, I'd choose the pretty one every time. That's probably why I'm writing this on a Mac. Ahem.
Anyway, here's a quick look at five of the finest looking homemade bike lights on the web today. This is an admittedly subjective list, so feel free to smack me around in the comments if you think I've overlooked the BEST. LIGHT. EVAR.
This bike light is super clean looking. The cylinder gives it a sort of Buck Rogers vibe. Just needs some fins for additional heatsink!
This is a really cool looking little light with excellent instructions. And I do mean little--check out some of the pictures to get a sense of the scale. With so many fins on the heatsink, it must stay pretty well cooled off.
I love the look of these sawed-off mag lites, but this isn't the best photograph I've seen, unfortunately. There are several other renditions of the same concept out there...just couldn't find 'em in time to post! Maybe a Kindly Reader will help out....