This activity can be used with a non-musical substitute covering in the music classroom. Students color the boxes of the quarter notes, two-eighth notes, and quarter rests (different colors) to reveal a picture. In my tub, I include a completed copy for the sub in case the students have questions or can't remember what those notes/rests look like. This is a PDF file and is blank -- the cover picture shows the finished product when colored.
Materials needed: purple, yellow, and green crayons