Colour Combinations

I have been looking at and recording colour combinations of my selected favorite plastic colours. I have chosen to specifically use Black, Bobbly Grey, Misty Grey, Misty White and Clear. I have been arranging my samples together in order to find collections of three colours that compliment each other. I have chosen to use:

Black, white, clear
Bobbly grey, clear, black
Grey, clear, white

I needed make sure I didn't have any clashing grey on grey combinations.