Tablecloth Drop Cloth
Vinyl tablecloths—the kind usually used on picnic tables—make great drop cloths. They're tougher than plastic sheeting, and if you put the smooth side face down, they don't slip around on hard flooring the way canvas drop cloths do. On carpet, put the smooth side face up. These tablecloths are cheaper than drop cloths, too: $2 to $4 at discount stores.
Paint Bucket Caddy
Whether you're painting a whole room or just touching up, set your paint can in a bucket. The bucket prevents spills, catches drips and gives you a place to tuck your rag.