Why not shelves and some artwork? A large clock would make me feel a little pressured, but of course it's your office.

Shelves can look cluttered. Since this is the wall you see from the entrance, I would put a large art piece there and storage/shelving elsewhere in the room.

Well, whatever you decide, I think that cat is not to be moved. :)

I hadn't even noticed the cat. They have a way of occupying the center of a workspace while camouflaging themselves. Forget the floating shelves and go for a floating cat instead.