The quilts are beautiful. Don't underestimate your own eye for color. Yes it's helpful to study primary versus secondary colors, tone, depth, the color wheel, etc., but I did my first project without knowing anything about those things, and I thought it turned out great. Now I know a lot more, and my work will improve, no doubt. In my opinion, we are all always on a learning curve, which is one of the things I love about quilting. And I'd say you're off to a grand start!
Shhhh! Don't tell anyone, but I spend a lot of time at Good Will and the Salvation Army. You wouldn't believe the gems I've found there! And don't forget consignment shops too. I've picked up 100% cotton shirts and blouses for cheap, and they still had the tags on them! And don't forget skirts, dresses and draperies. It's always "check the fabric". If the fabric is good, and what you want, and not worn out, and something you'll actually use, it's a bargain.