Create your own nerdy icosahedron with some simple modular origami. Ok, technically it's not "origami" origami because the units are made of rectangle pieces of paper but if you call it origami I won't hold it against you :)
It can take awhile to fold all the units for this little guy but I think the end product is worth it.
To make an icosahedron ornament, gather these things:
-5 sheets of green origami paper
-5 sheets of red origami paper
-5 sheets of gold origami paper
-something to hang the ornament with such as some string, a paperclip, or an ornament hook
I used smaller origami paper that was about 3"x3" and it made a model about the size of a bulb Christmas ornament.