These are my horse showing colors and they go really well together especially on a black or bay (dark brown with black mane and tail) horse. Should be number one. These are my 2 favorite colors and I think they go well together. Red is a warm color while blue is a lighter one and the just look nice together - Cartermd. Definitely my favorite. A light blue with a bright but low key (oxymoronic) red is awesome to look at. I painted my room blue with red doors and my bike is also red and blue with hints of black and white.