The previous advice is good especially if you are quilting it on a long arm. That being said, you might look at the back as another creative opportunity. I often try to incorporate some extra blocks from the front onto the back as well as using some coordinating fabrics in large pieces in the back design. If you google "quilt backs" you will see lots of images for ideas. With just a little extra piecing in the back you will create a reversible quilt! I would avoid trying to be too symmetrical or trying to add border type strips as I have found it difficult to get an exact placement of the back when you sandwich it, so I don't try to piece anything in the back too close to the edges.