i have an idea to make a costume not done before (or at least that I've seen): The human combat flood form from halo 3. I want to make the armor out of something simple (since it is not the main focus of the costume) like foam or even cardboard. for the actual flood part, i want to use putty or clay and put it on the sleeve and torso. for the head, I could try something like a halloween mask, and cover my neck so i can actually take off the costume. for the flood arm, i might use a metal rod or a stick for a frame. Any suggestions?