Watercolour triangles let students paint paper with watercolors, wet on wet, similar colors. Let dry and cut into triangles. Students pick triangles and glue down randomly, leaving white around each one. Maybe try with black or other color background?
I spotted these paper diamonds over at MiniEco and will be giving them a try this weekend. How cool are they in a rainbow of colors? Pop over to Mini-eco for the printable template and complete step-by-step instructions.
Put a sticker on your apples while they are still green on the tree. As they ripen, the part under the sticker stays green and you have a custom stenciled apple. Like I'm going to spend time putting stickers on apples.