Dwell forums, and it just may save the day for us. We want to use an Ikea kitchen base cabinet in the master bathroom. The problem is, Ikea's bathroom sink won't fit the kitchen cabinet.
So, instead of a $900 materials and labor cost on cutting granite to accept an undermount sink we could do this: $50 chunk of butcher block wood countertop and a $60 Ikea sink. The wood fits the cabinet, and a hole is cut into it to fit the sink. Problem solved.