I love these twee little things! And apparently, all you need is two lighters you can get for a buck each at your local corner store/bodega. They’re not drivable, though, unless you’re Tom Thumb. I dub them motortwinkles.
I suppose you could figure out how to make these with a little trial and error (and glue), but I don’t think I could. I can’t deal with little fiddly things like that, they make me angry. I don’t have big fingers or anything, but I just can’t manipulate those tiny gears and such without aggravation.
Lots more pictures here, though none really show the process.