I can see the beautiful quilting and am amazed that you did it by hand. If you are really unhappy with the top, but love the back, flip it over. It is your quilt and you can use it any way you want to use it. I love the back, too. :)
To answer your question, Yes, I have done it. I pout for a short while and then try to find a way I can be happy with it. :) Most of my things are given as gifts, and I can always find someone who loves what I make. :)