Just get the X2 in fluorescent orange. I'd suggest 4 ounce batches and start with three drops for a transparent orange. If you want something more opaque just do a mini batch with about an ounce of plastic and five or six drops of the X2. When its cooked add it to the 4 ounce batch and reheat and blend together.
You can add glitter or hi lites or whatever after you settle on the basic color.