Last family photos we had (which turned out really nicely), we wore shade of blue, bone, grey and white.
I wore jeans and a white, lacy sleeveless top, DH wore a navy polo and bone cotton casual trousers, DS1 wore a light blue shirt and greyish trousers and DS2 wore a light blue and white shirt and grey trousers.
None of our clothes matched (ie were the same colour or same style or pattern) or were overly patterned. They did compliment each other thiugh. What helped was laying all the outfits on my bed and seeing what went best together.