Try these dishwasher safe, rustproof, high-density resin plastic floor registers.  Great for your bathroom, or where there is a lot of moisture.  Rated to hold up to 300 lbs.

These decorative floor registers will look great anywhere in your house.  Made of a high density plastic resin, these are rustproof and work exceptionally well in the bathroom.

These plastic registers are able to be cleaned by your dishwasher!  The rustproof material of these registers makes these a perfect choice for any room where there is a lot of moisture.

This polished brass ABS high density plastic register is safe for use in the washing machine and is rated to hold up to 300 lbs. 

Oak contemporary plastic registers are great for rooms with high moisture content, like bathrooms or kitchens.  Accent your woodwoork in any room with this scratch resistant register rated to hold up to 300 lbs.