I love BOTH fabrics but i think which i used would depend on the room it would go in. If it was in the kitchen, i like the Pumpkins and then use the dark fabric for binding and the back. If it will be used in the family/living room i would use the dark fabric. But thats what would work in my house.
But honestly, I absolutely don't think you can go wrong..... Your quilting is the highlight and of this topper and it is BEAUTIFUL!