Here's this neat 12-sided calendar papercraft generator:
I shall do the regular dodecahedron, most because it only takes up 1 page. Alas, at the time I checked this out, the generator seemed to be using the wrong encoding for displaying Unicode characters (which applies to Chinese and Japanese, and maybe more), and that incorrectly displayed output was used to produce the .pdf and .ps files, which meant now there was no way to correct the texts displayed with the wrong encoding, as far as I knew. Oh well.
The regular dodecahedron, entirely in one piece. Oh man, those gigantic glue tabs!
It's done. It turned out a little bigger than I expected, just slightly bigger than the standard 3x3 Rubik's cube.
So yeah, this is a pretty simple model, but still pretty awesome.