Give the children paper towel rolls and ask them to color them with markers. The towel rolls will be the tree trunks.
Help children trace their handprints on the green paper. These will be the leaves on the trees. Six handprints are enough for a full canopy.
Cut out the handprint leaves and glue or tape them to one end of the paper towel roll. This is the top of the tree.
Tear newspaper pages in half and crumple them. Stuff the crumpled newspaper inside the paper towel rolls. Leave about one inch empty at the bottom of the tree.
Cut four one-inch slits in the bottom of the trunk. Fold flaps out and glue or tape them to the poster paper to hold the tree upright.
Keep adding trees to the poster paper to create a paper rainforest.