My mom used an old dry sink (similar to this one: http://www.greatwindsorchairs.com/images/dry_sink-mlg.jpg) as a changing table. It was perfect. My sister started her family first, so she got dibs on it, but there's not a day goes by that I don't wish I had one just like it. (Mostly because the doors would deter my kidlet from pulling out everything underneath; clothes might actually stay folded!)
I just love old dry sinks (my folks have one in their dining room). They make a PERFECT change table and doors are a definite must.