My dad had a decent idea of using slatwalls, like they use for displaying shoes on walls at stores. There's a nice variety of looks for it, and you could make it work with your decor. Maybe not as slick as being able to slide the speaker around willy-nilly, but I still like the idea. I'm just not sure how hard it would be to find something that slips into a slatwall that you could mount the speaker to, or how much weight a slatwall is rated for. Stuff to look into, I suppose. Of course, running the cable would be an issue, but it would be an issue for the sliding speaker mount, too.
