I decided to have my kids make their own paintings for their bedrooms using canvases that we bought from the dollar store and kid's tempra paint (also from the dollar store). They decided on bright colours with 2D shapes. It was sooooo easy. I am thinking on buying the little ones to use in the classroom this year.
Step 1: Tape borders and shapes with painter's tape. Press down well.
Step 2: Paint. Let dry
Step 3: Peel off tape (the fun part!)