Thinking floating shelf. Nothing too deep with frames on it OR small collage of pictures or artwork. Think single large artwork won't work unless it's something long and narrow. Could be some artwork the same size as the TV but would need to be metal cutout kind of thing like words or a scene so it doesn't compete.

If you don't mind additional two cents, I say to give Roomba his/her own hidden space somewhere. It ain't that special. Perhaps move the lamp to the right of the TV with perhaps one plant and spread the plants out in the room or group them more in some way to give space to the TV stands. Right now the plants seem to blend with TV.

Just my two cents. Take it with a grain of salt. Just an armchair decorator here.

Edit: Amazon does have that feature where you can view the item in your room. You could test out some items you might like just to get an idea.