When I get my Ed30 I shall be looking into the possibility of repainting it in laser Blue. I reckon it would re-sell ok, as it's such a popular colour on the mk5 scene. In fact, if done properly, It might even add a premium. However, my number one priority is getting the car I want, as I fully intend keeping this one long-term, so the 'resellability' is secondary.
Your thread has, however highlighted the importance of having the engine removed. I'd be put off buying a car with a different colour in the engine bay.