Paint the walls in tan, beige or off white. Paint any trim or baseboards in the same color as the walls.
Hang curtains or blinds in muted green, khaki, tan, brown or gray, depending on which camouflage color scheme you are using.
Look for a rug with a camouflage pattern. These can be found at many bed and bath stores, or discount department stores.
Choose a comforter or bedspread with a camouflage pattern, and sheets in a solid color that complements the bedspread.
Hang posters or artwork with army themes. Soldiers, tanks, military planes or ships are all popular images with most boys. Choose pieces in settings that suit the camo color scheme you're working with.
Display a collection of army-themed collectibles, such as model tanks, planes or ships, or quality miniature toy soldiers.
Shop your local surplus store for a few army accessories to hang off the back of a chair, the doorknob or the corner of the bookcase. Items such as canteens, military belts or vests will add an authentic army touch to the room.
Purchase a wastebasket, lamp and desk organizers in neutral, muted colors that match your camouflage theme.