We love this idea for using coffee filters! Perfect idea if you are not expecting snow this Winter in particular! DIY Coffee-Filter Snowflakes: Make a beautiful cascade of snow in just a few simple steps
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?