Just spotted this on another thread, looks like there is another one to add to the cascade indigo list. Looks like the right colour, just happens to be on the wrong car.
One of my work mates who takes the p*ss out of my car took a picture of a very similar cascade indigo mini outside Shepperton station.. As already mentioned, I think the paint job must have cost more than the car's worth...
At least it's popular !! (no, not common, popular !)