If you need an extra layer of playfulness, you can paint the polka dots different colours. Or you may wish to choose delicate colors so to deliver the intensity of the motif, with out overdoing it with an intense colour too. How to Hand Plaster Walls to Cover Over Wallpaper or damaged partitions. Oh, lake home kitchen, your 3 sorts of wallpaper could also be coming to an finish. Apply the sponge to the wall floor, creating random patterns as you blot with the sponge.