I second the magic whiteboard. It will static cling to anything, including the ceiling! It comes in a carrying box, like cling film. So you can easily take it

I second the magic whiteboard. It will static cling to anything, including the ceiling! It comes in a carrying box, like cling film. So you can easily take it to client sites and stick it on their wall/glass. Further, you do not have to erase them, you can just stick a fresh one ontop. In that respect it is more like Butchers Paper.