Here's most of the art department with their Ninja Turtle outfits. (Dustin, Chris, Nader, Seth, and James.)
Halloween at Reel FX is fun. I don't know how other studios are, but everyone seems to have fun dressing up and having a relaxing day.
My favorite costume of the day (and the one we all voted as this year's best) was one of our animators, named Ken, dressing as Ken from Toy Story 3. He even walked around like Ken all day. Sometimes a simple idea well executed is best.
Keep it super groovy!