I've always wondered why some company doesn't screen fine art on acoustically transparent cloth with acoustic fiberglass underneath, and add a fancy picture frame. Everyone would be raving about the attractive new addition, not knowing it was there to help the acoustics :^).
When I was formulating my DIY panels I found a company that was doing just this. I'll dig around; maybe I can find it again. In any case, youd send them a high res file and they would print it as a panel. I thought it would be great for some theaters to put movie posters on the walls.
I ended up making some panels myself, but I used Acousticotton instead of the OC fiberglass. The cotton is more expensive, and it is definitely safe, but most importantly to me is that it is very durable. You can walk on this stuff and it will spring back to its original shape. This was important to me since I knew my kids would be rebounding off the panels.