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Rugs Over Carpet: Yay or Nay?
How to secure a rug on top of carpet: Make sure you purchase a vinyl stair runner with "cleats". Place them facing up.
Rug on carpet doesn't have to be a dealbreaker. Living Rooms with Rugs on Carpets - Apartment Therapy
Bedroom Rug Over Carpet
More pictures of area rugs over carpeting.
Drool Worthy Decor : Dramatic Master Bedroom Makeovers | The Budget Decorator
Layering a Rug Over Carpet? Expert Advice on How To Make It Work