I've seen several variations of these hanging corner shelves available, including ones with inbuilt picture frames. I think the panelled parts against the wall make it more of a feature so it's a nice solution for a small empty corner. It's also an idea that you could easily DIY.
Instead of placing your photos and art sporadically around the room, cluster them together. This move deliberately defines a wall as your entry, sectioning it off from the rest of an open layout. See more at The 36th Avenue » - HouseBeautiful.com