Match Wheel

This uses the "digital complementaries", not artist's complementaries. Use colours from each quadrant or from opposite quadrants for interesting effects. Avoid colours from outside two quadrants.
A quadrant can be any combination of three colours on the wheel which can relate to another group of three colours. Usually a quadrant relates to a single subject, i.e. 3 sun colours vs 3 snow colours etc.
Thus if the colours you choose follow any theme then it should be OK even if they do not align to any quadrant. Random disassociated colours should never be used!