What a fun idea! And I like the idea of the rain sticks too! Love this and would be great to do when making Rain Sticks instead of tissue paper then enclose whole thing in contact paper to keep while shaking rain stick.
grade work- this is a great idea- want to try with upper grade and use colored construction paper, have students cut out tree silhouette out of white paper to go on top. Possibly try this with self portrait collage idea.