A fireplace fills a room with a sense of warmth and hospitality and marble gives off an inherently regal quality. However, if soot has stained your marble fireplace for years and is now a permanent part of the surface, your fireplace may look more distressed than elegant. On the other hand, your marble fireplace might simply look too old-fashioned for your room, and an update may be in order. Paint offers you an easy, nearly instant solution.
Moisten a soft cloth with distilled water and rub the exterior of your fireplace as vigorously as you can, removing as much caked-on grime as possible. Tape off the areas you don't wish to paint with painter's tape. Lay a dropcloth on the floor in front of the fireplace.
Spray the fireplace with a primer designed particularly for marble. Cover the fireplace in a single, even coating. Allow it to dry thoroughly.
Spray a single coat of a paint designed for soft stones like marble. Move the spray can back and forth in even, uniform strokes until you've covered the entire surface area of the marble. Allow it to dry and apply a second coat if you like.
Remove the painter's tape before the paint is completely dry.
If you feel so inclined, install decorative tin or ceramic tiles to the centre of the fireplace mantel as another adornment. Simply add adhesive to the back of the tile in an X shape and press it in place on the fireplace.