While fixing up a small room in our basement as a Zentangle classroom, we needed to cover the ceiling pipes and wires with some white panel board. When we were done we had a couple of extra end pieces. Of course, I can't look at anything white now without wanting to tangle it! This piece is approx. 2 3/4 ft by 4 ft and is now hanging on one of the walls. I used black sharpie markers, and for shading I used a silver marker (that doesn't show up very well in the photos). It was really fun, doing something so large.......maybe I'll have to try one of the other left over pieces of tile board.