Create small dents in a new piece of inexpensive furniture with a mallet. Hammer small chips out of table and chair legs; hammer carefully so you don't break the legs. The small dents and nicks make the piece look gently worn.
Use sandpaper to sand sections where the piece would naturally become worn over time, such as the arms and seat of a chair or edges of a dresser. Sand in the direction of the wood grain to make it look more realistic.
Use a wire brush to create scratches in areas that would become worn over time, such as around the pulls on a dresser or chest, the front of a chair or the top of a table. Use a file on edges. File in the direction of the grain.
Drill a few holes in a grouping to make the wood look worn and damaged.