ctitatic don't you then have to remove the pen every time you want to open the keyboard for typing? Otherwise the keyboard won't lie flat, and the magnetic piece won't connect with the lower bezel. That seems like a real pain to me.
I bought one of these from the container store for $4:
http://www.leuchtturm1917.com/en/content/pen-loop
I bought it in black, I ordered sticker boy skins and I used the front screen bezel to cut up and match the sticker to the pen loop.View attachment 3491 View attachment 3492