I purchases these amazingly beautiful, white Carrera marble 4x4 tiles at Habitat for Humanity for only $0.40 each months ago to make the runners bib coasters for my husband. I scooped up every single one that was not chipped and almost ran out the door screaming "start the car".
For my girl friend, I decided to do something a little different then a standard set of 4 coasters with 'F's (her last name initial) on them. Instead I made one for each of the members of her family. So when they all are having a glass of wine with 'F's etched on them, they can use their individual coaster with their initial on it so they can keep track of their glasses.
Have a great day,