OK help me pick out the another color for three walls plz!!!!!?

I love that! You could do a black, but if that is too dark for you, you could go with a lighter purple. If you choose purple, make sure it doesn't have a blueish gray under tone, because then your room could look dreary. If you added fuchsia sheets, you could do that for the walls too. You could do them the color of whatever color sheets you are choosing really. Hope this helps.