Line Easy DIY Abstract Art! different sized tape over white canvas. Then spray paint color of your choice. To prevent paint from seeping under tape, use a primer over the canvas, or you can just use touch up white paint when you remove the tape.
Something like this in the front room. (Different colors) Plywood, Painters tape, and different paint colors. I can't wait to see the look on people's faces when I say, "Yeah, it's just a little something I threw together one day while bored.