Well, if you read news:alt.games.marathon news group often than you know about the thread to accomplish this type of shapes patch. Brett Engle decided to get involved and the bob now totes a shotgun with some pretty good sequencing.
Changes your assault rifle into the MO-M/DWN Mini Gun. This 2000 round weapon is 15 times more powerful than the MA75, and will slice through anything that is foolish enough to get in your way.
Turns BoBs into light blue (or light grey) Gumby dolls. Pretty high quality, and the death sprites are entertaining. Anvil v1.0.2 or higher is required for installation.
Turns Jugs into "Hollywood Art Directors". The face was captured with a camcorder, so it's a bit pixellated... but It is pretty fun to blast him, though...
Replaces Fighters, Troopers, Compilers and Hunters with characters from the creator's childhood nightmares. This is now an Anvil patch, and requires v1.0.2 or higher.
Gives you sights for your weapons in Infinity. If you have trouble aiming the SPNKR, this is for you! (This will eventually migrate to the Infinity shapes page, once it exists...) Update is now an Anvil patch, but it needs Anvil v1.0.2.