Amazing! You are far from a beginner. I never use solid fabric for my backing. I still have a lot to learn and since I have to buy the backing fabric anyway, I choose a block I have been wanting to try and make it very very big for the backing, or I do a couple of them. This way I don't have a tons of seams, but I'm learniing and got to try a pattern I have been wanting to try. Sometimes, we end up liking the back of the quilt as much as the front.