I have two projects like that right now. One is queen size that was initially intended to be a Christmas present for my sister-in-law. I bought fabric for that quilt 3 times. The second set of fabric I finished the top and it was just awful. I am going to donate the top and backing to a group that can finish it and give it to someone who needs it.
Maybe you can finish it and donate it. Then it isn't a waste, you'll learn, and someone that can use a quilt will get something that can give them comfort.
ETA: I love the second one! That little pop of the darker color really brings it alive!