If you're looking for a unique bike, might I suggest skipping metal and opting for a wooden bike? I mean, seriously, how cool would it be to ride around on a handcrafted wooden bicycle? I imagine it doesn't have the strength of its metal siblings, but dang it's cool looking.
This bike is made by Sman Cruisers, which specializes in badass wooden bicycles. I know what I want for my birthday now!
[Via Blue Ant Studio]