My husband teaches Philosophy and did a take on the Philosoraptor costume idea. He used a child's dinosaur hat and a white sheet to make a toga. He painted his face and half his body green with face paint.
He wore a sign he made on the computer that says "Caution: Approaching Philosoraptor may result in Existential Angst and/or evisceration." He laminated the sign with packaging tape and tied it on with twine.
I decided to make a homemade Nyan Cat costume after seeing the video of the internet meme called Nyan Cat. It's a gray cat with the body of a big pink Poptart that is flying through space with a rainbow behind it.
I wanted to be something colorful, original, and fuzzy, so Nyan Cat was a good fit!