Yes, rainbow blinky barf is what I am after really, Mario Kart Rainbow Road in synth form.
The two pin rainbow colour change ones was what I meant - I was slightly concerned that the forward voltage might change as it changes colour and make things a bit illegible.... I guess I could just test that though thinking about it now.
I suspect I may eventually regret the decision due to it NEVER STOPPING, but on the other hand, it's going to look ridiculous and insane and I think that might well be worth it.
Thanks for the encouragement in this folly, I was expecting a lot of "oh I wouldn't do that"