A buddy of mine had tower fronts and in-ceiling surrounds, and I thought it worked surprisingly well. The rear speakers being behind the listening positions produced a nice, diffuse surround sound that created a very seamless and immersive experience. That's what I'd do if I was creating a home theater since it worked so well, with the obvious added benefit that the speakers were completely out of the way and basically invisible. If you're thinking of getting seriously into surround music I'd probably use traditional box speakers.
Sounds like you don't use a center channel speaker?
Sounds like you don't use a center channel speaker?