Agree with Zlin526 about G-REAP.......the paint job is just too "busy" and the huge "GHOSTBUSTERS" written down the side is horrible. G-REAP is currently gathering dust in the back of one of the hangars at Netherthorpe - hasn't flown for months.
One of my favourites is the Pitts S2S G-EWIZ - simple but effective:
Another Pitts that is really cool:
(This picture doesn't do it any justice - very bright yellow and amazing metallic purple)