I started off with a couple of ancient layer cakes, one batik and the other in regular quilting cotton. These are old and I have no idea what they were called.
One of the joys of layer cakes is that you get an entire palette of colors to choose from. Then you can go to your stash and find fabrics that will live with or complement your original color scheme. Most will work, some won't. It's fun. Why don't you try it? You have nothing to lose except having a pile of fabric around, which you can then put away.
One caveat, though: Just because they live well with each other when they are on top of each other doesn't mean that the final product will be what you imagined. The size of the pieces and where they are placed have a major impact on how you see the colors. That's the fun of it.
Tomorrow we'll talk about how I actually construct this block.