Paint the walls in a warm color that will allow the antique keys to stand out. Creams, pale grays and tans are neutral, so they will work with a variety of other colors and styles, and won't detract from the color or texture of your keys. Alternatively, hang wallpaper on the lower portion of your walls or on a single wall with an antique key print or design.
Screw small wooden pegs into the walls to hang large antique keys. Create a straight line for about five keys or three huge keys.
Tie the antique keys to fishing wire to create a long strand of keys. Screw small hooks into the ceiling or high on the walls and hang the strands of keys. Hang at least 10 strands to create a beaded curtain look.
Hot glue the keys to photo mats inside thick frames or shallow shadowboxes. Hang the picture frames on the walls.
Fill glass bowls or vases with random antique keys to sit on the mantle, sofa table or end table.
Accessorize the room with throw pillows, prints or artwork that depict images of antique keys.