Take a canvas, and cover it with stickers/decals (or cut your own) and spray paint the canvas. Remove all the stickers, and hang lights behind it for super cool decoration. You could even do this in your room!
Painted rubber door mat wall art $1.00 doormat from the dollar store,Heirloom White spray paint from Home Depot,once it is dry after spray painting the doormat all over,sander them to give them an aged feel! or they could be left just painted.