Obama is making his first trip since the election to the Oval Office today. I wonder if Michelle will come with him to help him feng shui the place out. God knows it needs it after the past eight years. In fact, it probably needs a seance and some herbs to be burning in the corner. It wouldn't hurt to replace the carpet either--you know W's spilled shit on there and never told anyone about it (and to be fair, I would have too).
Here's what I suggest--limit the family pictures and just go for a clean look. I can tell you from the clutter on my desk that a clean office would be a great start. You can always add things later if you need them.
Oh, and nothing says "it's just another day at the [Oval] office," like a red stapler.