DescentBB

very cool;
http://abduzeedo.com/10-awesome-dollar-bill-origamis

Interesting, do you know if these are done by hand or machine?

no idea, I guessed they were done by hand.

Definitely done by hand -- there's a lot of fidgety work to do getting a model like that right. The thickness of the paper matters at that scale, especially with something like a dollar bill. But many origami artists do use mechanical assistance in the form of tweezers, toothpicks, and the like. If this guy's working that small, I'd guess he does.

Though it's not impossible to do with hands alone. I used to make a lot of things smaller than a dime without anything but my fingers. Origami artists take pride in putting very weird restrictions on themselves, and I was no exception back when I was serious about it.

folding a butterfly video, taken from his friend's blog. Looks like that one was all by hand, without tools.

his deviantart page has several interesting models, including a series of Star Trek models.

I dropped him an e-mail to ask if he uses tweezers, toothpicks, or any other tools like that. I'll let you know what he says.

Pretty damn cool! I like the Scorpion, the Koi, the spider and the hammer head.

I think the toilet bowl wins.

I love how he uses the texture of the bills for his work. e.g. the wrinkles on the bills that make the fishs' eyes and so on...

He uses tweezers for small folds.

That's cool.

dolla dolla bill, y'all!

(you knew this was coming) ^_~