I found this gorgeous idea through ThatArtistWoman, and thought my 4th graders would enjoy it. So, I picked a class, and we rolled with it ;) We used real watercolor paper (and I am limited on this). They were about 6x10 or so. Then, we taped them down to a board (we used our weaving boards). Then, the students did a wet-in-wet watercolor technique for the background. The next day we watered down some brown tempera, dropped some in the corner and used our straws to blowwwww out the tree branches. Of course, you have to continually drop more on. Some of the kids did have a very hard time with it. I had some light-headed and dizzy ones after all that blowing. Haha. They added with q-tips some little pink, red or green dots to make the trees look in bloom. Sorry for the terrible quality pictures.