Shoebox lid & craft sticks- these are wide ones, and low temp glue gun. Endless fun and all you need is a shoe box lid and Popsicle sticks! Build a marble run or "Plinko" with all kinds of different creative designs via Frugal Fun For Boys
Tower of numbers: Each roll of toilet paper has a number on it. These toilet paper rolls will need to be placed in the correct order to create a tower. (Place a circle piece of paper between the rolls to make it easier to balance.
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?