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?
wall art inspiration: Paint the canvas all crazy like Use painter's tape to create a herringbone pattern with some missing Paint over the canvas in white Remove tape and voila! Very neat idea, not sure about the pattern
Run crayons through a hot glue gun onto canvas. A design or letter would be cool too. (**Do NOT do this try the other glue gun crayon projects don't put the crayons in your gluegun! use the dryer with them glued to canvas)