Here's what I mean. I can have 2 prints with orange and pink, but if they are the same lightness/darkness, they will simply blend together. These 2 fabrics, for example, coordinate, but they don't stand out if put together. This one, on the other hand, is made like a quilt with varying shades and varying values of those shades. Here's a quilt I found online that shows good color value variation:
It has lights, mediums & darks:
So, today, after I work on a bag I have GOT to finish, I'm going to play with all my fabric again & mitch----um, that's dork for mix & match! LOL! all my pieces so I can have some VALUES!
If you are a scrapbooker or card maker, I think these same principles can apply to papercrafting.
Happy colorful day!