For Reddit's (http://reddit.com) Secret Santa 2010 (http://redditgifts.com), I designed several reddit-related printable objects. They could be used as refrigerator magnets, ornaments, or desk swag. I had trouble printing the Reddit Alien by Zorink (http://www.thingiverse.com/thing:3300), so I imported the STL into OpenSCAD and re-built the model from scratch.
All the SCAD files are licensed GPLv3.
Note: the envelope and upvote scad files depend on the MCAD library (https://github.com/elmom/MCAD), which I've included a copy of (along with all the STL and SCAD files) in reddit.tar.bz2.