Wow,great quilt! I love the bats in the border idea, but I'm wondering if your haunted house will actually show up. The fabric is so vibrant. What color thread were you planning on? It would need to be highly contrasting. Maybe do a bit of test quilting on a scrap sandwich that's made up of all the fabrics, or how about a mug rug. That way you could see if all your hard work will pay off or get lost in the top.