I just got some panels from GIK Acoustics myself--I needed diffusion/absorption panels. They have a lot of configurations, including something they call Acoustic Art--absorption panels with a large photo on them (either art from their catalog, or you can upload your own photo and they'll print it for the panel).
These are what I chose--they're 24"x24", 2" thick, four to a box. They took about 10 weeks to make.
I need a few more panels to put on my back wall, but want absorption. Nothing big, just a few smaller panels. They have some hexagon panels in a 12" size that would be perfect. I priced out making my own with material I liked, and the cost really wasn't all that much more for the GIK panels. That and my time is scarce--it would probably take me several months to complete them.