Nebula Galaxy! From 2007!||A few years ago, I made a pretty cool icon for an open source gaming project, with inspiration taken from the Super Mario Galaxy logo.
Stellar Icons From Space! From 2005!||I made a batch of desktop icons of Earth, the Moon, Mars and Venus. I wrapped spheres with some planetary textures from NASA, then added shadows.
SubCritical App Icons||This was a set of application icons I created for an open source project called SubCritical, and its suite of associated documents.