Strike the bed with a hammer and mallet to put dents in the wood. Make more dents to create a more dramatic look.
Sand the bed around the edges to mimic the look of natural wear. Take off more wood around the corners using a course grit sandpaper. Use a fine grit paper to smooth random areas on the bed that would be more likely to show signs of wear, such as around the legs.
Scratch the surface of the entire bed using a wire brush. Pay close attention to parts of the bed closer to the floor where the bed would have been kicked.