Red goes well with green, for instance, as they are complementary colors and opposites attract.  Yet, you shouldn't use 50% red and 50% green as it could be annoying for people’s eyes. You could also use shades of blue to add a third color. Remember the 60-30-10 rule! It’s also a great idea to combine red and pink with a light gray background. Thus, giving the impression of being not only creative and fashionable but also more lively. Another good idea is to combine red with black and white.