I used a set of football pads off of Ebay, added some spikes from some Goth Halloween store accessories. The crossbow is a cheap pistol version that I sawed off and mounted to a shin guard. I also got a set of catcher shin guards, modified them, added mounts for crossbow bolts. I made arm and elbow guards from shin guards. I used a handful of leather belts got cheap from a second hand store for straps. The torso armor is a rubber walkway carpet protector from Home Depot. The rabbit skins came from the Internet. I added some fake bones and teeth, painted to weather them, from the Halloween store. Then there's the mohawk with some temporary red dye. A black feather boa worked for the trim around the neck of the football pads. I painted everything flat black and weathered it with brown and grey acrylic paints, watered down heavily. The boots are some SWAT boots I already had. And I got a military issue gasmask at a Halloween store, painted the filter bright red. I also modified some old filters on my paint and fume mask and wore that. And I had a pair of industrial looking goggles that went over my glasses.
I put together several other things for the Harrison's Halloween party and for our house. Today I had a bit of time and I threw together a rough Gonk Droid from stuff I had in the garage. Another day of work on it and some paint and I think it will look pretty good:
There are two 18 gallon tubs, a 9" baking pan, several scrounged parts screwed into the pan, and some simple 2x4 legs and feet with dryer vent hose over the posts. This needs a lot more work but it was a good quick start on the project.
I should also mention that I recently did a little event at a local Gamestop when The Force Unleashed II came out.