You know all those empty jars you recycle or use as vases or for cuttings? You can use their lids as saucers for your smaller plant pots!
You can also place them under bottles of oil in your cupboards, shelves or in the refrigerator so that you'll never have to clean up those pesky drops that always seem to find their way out of the bottle!
You can also place them under bottles of liquid plant food for the same reason!