Why not try the rule of three when choosing fabrics....
The rule of three means what ever part of element of the design you are working on choose three to work with.
For example:
color value; light, medium, dark
size of fabric pattern; small, medium, large
Pattern elements; curvey, geometric, solid or works as solid
You can mix hues of the same color family as long as one of the mix has some yellow in it. For example all kinds of red as long as one is an orangie red, all blues as long as one is a blue/green, or greens as long as one is a limey green.
Add a little pure yellow to the mix if you can, like choosing a large scale print that has a strong yellow element.
Try not to get too matchy matchy as it tends to blur the pattern when viewed from a distance, same with choosing too many medium values even though you have lots differing hues. Mix it up with different hues or values of the same color.
A good trick in choosing colors is to look through the view finder of a camera at the fabrics you are considering using, do they mush together...too many of the same value, is one overpowering the others, choose a lighter or darker value.
Look for a zinger fabric that makes the others sing in harmony.
And the most important rule is....It is your quilt so do it your way and if you are happy then all is well. :thumbup: