My newest painting is on industrial-grade grooved plywood. I found a bunch of pieces of it at a construction site, cut in various sizes and thrown out next to a dumpster. I walked home with all I could carry under my arms! This is a first layer of painting. I'll sand this down and then do as many as 12-15 more layers of paint and glazes. The right edge will get some gold-leaf paint, evocative of a frame as none of my pieces are ever framed.