Monochromatic? Complementary?

God damn, why are there so many different ways to paint a damn room?!?! You would think that once you pick a color that won't blind or depress you, you slap it on and then you're done. But if you want to do it right you have to consult a color wheel and decide if you want to stick to warm or cool colors. If you want to mix it up you need to decide what scheme you want to use. There's monochromatic, complementary, triadic, analogous, split complement, and double complement. After about 1/2 hour of going back and forth on this issue and also spending almost an hour in Kelly Moore, Ray and I have decided to stick with 3 schemes: monochromatic, triadic, and split complement. I think my head hurts........