Alright well I got a lot more good ideas from everyone than I was expecting, so I'll probably take another shot at this.
I don't really have another couch to use, but I have a couple ideas for making it less busy. One, I could borrow my wife's white bathrobe and set it up like it's just casually draped over the couch with the potato on top of it. The other idea is just to control the DOF better so that the back of the couch isn't quite so sharp (getting the focus ON the potato would help too of course).
I'm going to stop by the store and pick up a nice big potato instead of the little russets I just happened to have in the house. I'll also attempt to make it bigger in post, hopefully not more than double-sized. Technically I figured I'd cut the potato out and reduce the size of the background so that I don't lose any quality from up-rezzing. Is that a good way to go or is there an easier/better approach?
I also figure that if I'm going to increase the size of the potato, I'm going to need to be very mindful of the DOF because if I increase the size of the potato and it ends up in front of the focal plane it will look wierd.
As far as props, I'm still not sure. I like the idea of something reflecting the TV, even if it's not really there. Reflecting the blue-lit umbrella in something like a bottle might add some effect though.
All this for such a silly shot.
Anything else I should think about?