She says another great idea is to «draw with sharpie markers on clear contact paper and make decals for the windows, cabinets, etc.. (parentingsquad.com)
It's worked miracles in my home, including with Sharpie pens. (theinspiredroom.net)
We love using Sharpie markers because we don't have to worry about spending any time erasing. (artforkidshub.com)