I tend to pick 1-2 colours for a quilt and so far most of my quilts are different colours schemes. Except blue and green - I have made 3 of them 'cause it's such a pretty combo!! I have a lot of colour sets I want to make in the near future, pink/brown, bright pink/orange, yellow/blue, pink/green my list goes on.
I hadn't realized that quilt shop's fabric follow trends, but of course it makes sense. I tend to quilt with blenders so the trends don't matter since there are always blenders.