Do you mean a red purple and yellow car, or 3 different cars? Lol!
I have seen a yellow Lotus Espirit in moreton quite often as well and there is a guy (who I think lives above Motorworld maybe) with a blue Lotus Elise. I suppose it could look purple.
Also, there has been a Fezza hanging around a fair bit lately, I havent taken a good look at it, but I seem to recall it having the looks of a 355, but then it may just be an MR2 kit car...