I had a ball of Cannon white mercerized cotton yarn lying around and managed to make two coasters out of the yarn left from the ball.
I didn't block these anymore or starched them to make them stiffer (they'll get wet anyway). I used a size 3 IMIA steel crochet hook for this project.
The coaster has an elevated edging encircling the base.
Check out another blog entry I made about another white piece HERE.