People before were talking about doing a freeze version of this, maybe as a joke, but once you have two of these you're left pretty much with a spare biker costume that doesn't seem to really sell for much (and thus isn't much to waste) and so to try it doesn't seem too outrageous... You could probably even use the split head for it, which also doesn't seem to go for more than $10 or so, or any cheap half-way appropriate head.
Is anyone considering this or any other customising?
On this page
here it says the real costume was made with "glitter, confetti and white paint."