Since Halloween is my favorite holiday and it always bothers me when people make poor costume choices, I decided to come up with some ideas for the MMA universe.

Matt Hamill: a fighter
Dana White: wear a wig and be "Dana White, circa 1988"
Anderson Silva: a giant hot dog
Joe Rogan: shave his beard, put on a suit, and be Ari Gold
Michael Bisping: Peter Venkman from Ghostbusters
Rich Franklin: Lloyd Christmas
Frankie Edgar: a Gotti boy
Houston Alexander: Beldar Conehead
Kenny Florian: Don Flamenco from "Mike Tyson's Punch-Out!!"
Brandon Vera: a giant sleeping pill

(I'll be updating the list throughout the day with any others that come to mind.)