Closet doors, mirrored, painted any color.  Air Conditioner return doors too.

The possiblities abound.  One of the best ways to modernize your home or business.  Sliding bi-pass doors or bi-fold.  In any color you like.  In Tempered glass or Laminated, even if broken, they are virtually harmless.  Get rid of those old wood doors and liven up the place with a touch of glass.