Many a charming ceramic pots have been passed up due to the lack of a drainage hole. Sometimes I can't resist and I buy them regardless, attempting to do the French Drain (where did that term come from?) where you spread rocks in the bottom to provide a reservoir for excess water. Also, many a soggy, dead flowers...
I really didn't know that there was a ceramic drill bit you could use to drill a nice little hole right through the bottom of a ceramic pot. It looks a little like an arrowhead on the end.
Here's all you need to get started:
a nail or something hard
ceramic drill bit
something soft to cushion the pot
See the technique right here at Vivelyonline.
Photo Images: Vivelyonline.com