I did this the other day while drawing with the kids at the school where I work.  I was kind of trying a new style of tree than I normally draw, and working a little bit more on getting some details just using shading and such with the pencil.  I like the way it turned out, though it’s not exactly what I was hoping for.  But hey, you try doing it with about 40 4-6 year olds running around! 😛