THIS website rocks! They offer complimentary colors and color palettes that are awesome. It lets you search by theme or an RGB slide. It doesn't get any easier and is a GREAT design tool!
Plus I like looking at the pretty pictures :) Head over to design-seeds.com
for more helpful amazingness.
Another great resource for color is mycolortopia.com. On this site you can upload a photo of the room you want to paint and virtually put the color up without hesitation or regret.
It's really easy so pick the palette you love and start trying on some colors!