Based most of the colours on the Focus RS/ST ranges, as most hot hatches these days seem to be vibrant colours. Personally, I think the 6 pulls them off well.
mk2 Focus RS Green
mk2 Focus ST (ASBO) Orange
Perhaps not as bright as it should be, but I know a lot of you Z people like your yellow, so here you go:
My personal favourite, fit this with some LED running lights and a bit of 'bling' and I reckon it'd look AWESOME