i remember as a kid for crazy hair day i used that spray dye that washes out in one wash. i would use TONS of gel and form my hair around a water bottle on top of my head (so it looked like a cone). then i would spray stripes of green and purple.
I liked this. Maybe you could try three pig tails with some insanely colored ribbons (lime green, bright blue, and florescent pink are some ideas). Mohawks are always good (elmers glue is good to hold them up, plus it dries clear)