Code "Coaster"

We have discovered a way to keep the family from using a bazillion cups in a day.  We now keep coasters in our cupboard.  They are all different, with different colors, and some crocheted.  When a person takes a cup, they take a coaster to place their cup on, and it's a code to me that they are not done with it for the day.  Less dishes = less work and less water and less detergent. 


The kids will typically get a glass of juice in the morning and were getting new cups throughout the night, causing me to wash dishes more often.  Now, we have a "code" to reduce use.  Yea!