This could be a beautiful class project! Have each child create and paint a watercolor tree. Cut each tree out, mount on a background (black would make them really stand out) and frame!
Print Oak Tree illustration by Tracey Long of ChasingtheCrayon, on etsy
The Blue Oak - Ink and watercolor illustration - Oak tree - blue - print
Olive Branch Olive Oil Olive Branch Hand Drawn Olive Tree Branch Olive Tree Branch Olive Set Botle Oil Branch Leaves White Dove Of Peace Bears Olive
Woodland limited edition giclee print by EloiseRenouf on Etsy
Art of Nikolas Ilic: Tree Designs!