Color is a hard thing, I have not learned the technical stuff of how to match. But I find I can put together stuff that I like, but I use a program to play with color to see where it fits best in the squares. What I have a problem with is looking at what I want to make and have a particular print or style in my head of what it (the fabric) should look like and can't find it. I don't know if it doesn't exist or just haven't found the right store yet. Just pick what you like, then stack it in the cart or table the walk away for a few minutes, then come back and look at it again after looking at other fabric. This usually tells me if I really like the combination or not.