My house is done in greens, reds, yellows, grays, & plums--basically jewel tones. What is a main color in one room is an accent color in another room. I also use different shades of a color in one room and in different rooms.
Specifically, my kitchen is a deep green (main color). And my Family room is green (couches, rug) & golden yellow (walls). My living room & dining room is mainly red. I have a very open floor plan.
I must be doing something right. I get tons of compliments, even by interior designer friends.