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.
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!
Glue small old toys to a frame and then spray paint a solid color. (nice way to hold onto the things your kids love but don't necessarily "use" anymore...and well the solid color, lol, helps it look great and not obnoxious)