Here is a great example of the downloadable designs we go on about; who knew they could be so complicated and have moving parts? Perfect for all your Creationist friends and the historically challenged.
Flying Pig makes a wide range of paper animation kits that you can buy precut (like this T Rex) but they also have a download shop where one can buy anything from a Flying Spaghetti Monster to Schrödinger's Cat., starting at £2.95. They are fun and they are the future as we dematerialize and download everything the way we do now with music.
::T Rex from Flying Pigs via ::boingboing and if you want a free downloadable design, ::Furni and Big Chief offer one here. Here is some background on ::Downloading Designs