A stereotypical sculptor will be obsessed with materials. My recent material of choice has been cast cement. Whenever I get into these infatuations, I go out there and look to see what others have done with the material to see if I can't get to know it a little bit better. Here are some particularly nice examples of cast concrete that I found out there on the web:
Some of the work above I found on this wonderful blog dedicated to the love of concrete as a material for architecture and art: Concretely Blog