Your quilts are exceptional. Despite the difficulty, I don't know what would set them off any better than black. The colors in both is great. They show off your talent to perfection. I like the pattern in the first quilt.
Casey is in doggy heaven waiting joyfully for you to join him. He is not suffering but celebrating. Picture him as being happy, and that will comfort you. Do not delay in getting a new pet to give your love to.