I've recently painted the transport for my Khorne Berzerkers. It's the most red I've ever painted in one go, and I could never have done it without the excellent Citadel "foundation paints".
I sprayed the tank Chaos Black, coated it Mechrite Red, and then built up a solid coat of Blood Red. I believe I will highlight quite a bit with Blazing Orange, but we shall see. The most important factor is getting the army painted to a gaming standard, not to win any prizes for my not-so-great painting skills (altough they are constantly improving)