That's what I do, find a "focus" fabric then choose coordinating colors from that piece.
Originally Posted by
Tartan
If I am stuck when picking out colours, I use the colour dots from the selvage to help. The manufacturer puts the dots along the selvage of every colour that is printed in the fabric and you can't go wrong if you choose fabrics that match the dots. I usually try to pick a variety of small and larger scale prints in those colours to add some variety to the quilt top but sometimes I just go with blenders or solids too.