I did a camp theme last year, and I made a few pine trees, also, because I couldn't find any. I copied a clip art picture of some and traced them onto green and brown butcher paper from the overhead. It didn't take that long, because I only had to do the outline and then put the trees and trunks together. It probably took me about 30 minutes to make, cut out, and put together three trees. Just a thought!
