I finally learned to not be so matchy-matchy.
Jinny Beyer has this color theory about "bridging" from one color to another in a print.
This is the book that it was in: Jinny Beyer's Color Confidence for Quilters
I found it to be helpful.
Joan Wolfram also has some books about color theory.
For starters, just look at prints that you like - also look at the ones you don't like - and try to figure out what it is about them that appeals to you - or repels you.