This has to be one of my favorite Moriarty faces ever. The other ones are his 'suprised' face, and most of the faces he makes at his trial. Not to mention every other face he does in the entire show, ever.
A lego wall. Add this to my fun wall ideas. So one wall will have chalkboard paint, another dry erase, now a lego wall. Now I just need a felt wall for felt play and a magnetic wall. I saw this neat project somewhere about a ball track on a magnet wall.