A patch that incorporates the hunters from the original Marathon into the Infinity environment. Replaces the MOAH with a big black hunter who fires nasty firebolts... pretty cool.
Patches bobs to look like the title character from the movie, The Crow. Basically just puts a black-and-white face mask on bob. A pretty complete patch, as far as it goes... the dead bob still has the mask. Hard to see from a distance.
A package with a shapes patch, a sounds patch, and a physics model to give you the chainsaw from Doom. Not having ever played Doom (yes, I admit it), I can't say how faithful the reproduction is, but it looks and works pretty well.
A shapes patch which puts two different images onto a single texture. The picture you see depends on the angle at which you see it. Not perfect (by a long shot), but clever, and (to my knowledge) never done before.
A few wall textures have been replaced by lego-looking stuff, and the bobs have been replaced (mostly) by stiff-legged little lego guys (but don't kill 'em, they still use the original bob death sprites). Eh.