#3- Corner wedges, foam? something cheap just to cut off the 90 degree angles, is there something Paintable out there?Hey Undertow,
Foam exercise rollers work great in the corners. You can get them in varying densities, you can easily paint them, and it's easy to cut the 1/2 round versions in half, so they fit perfectly in the corners. They really do help tame an overly lively room.