Simple answer - unlimited colors for the wax. You can always add a little of this color and a little of that and wind up with an unlimited array. For my orange Tiki refill I primarily used orange, but also went with some red and yellow.
White wax is simple - add no colorant to the Goo base.
What i was thinking about was more like the source of the color.. Someone in here used markers to mix with the wax to make a nice color..And then i thought hey how about using car paint ?
well, the first step Da9L is that it be oil/wax based without anything that will break down the wax
gookit are only sold on ebay.
And this Goo kit from Amazon or E-bay works by the way :)