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what fun! this would be good to do in a waterproof canvas or one that was easily removed.
Not a fan of the room exactly, but it gave me a DIY idea for decorating a huge wall in our living room without painting it: Buy some scrap lumber (crown molding style?) and a few yards of cheap but cool printed fabric, staple it to the back of the wood like a frame and then hang it! [we could also do this on small scale with cheap frames from homegoods and fabric scraps from a craft shop)