The Math Lego site is an awesome depiction of mathematical constructs in Lego form. There’s a Lego Mobius strip, a trefoil knot, and several minimal surfaces. Very cool.
While it doesn’t have the beauty of mathematics, Adrian Drake as a very well done bust of everybody’s favorite superhero, The Tick. As I told Lisa, something like that would look great next to a green lantern.
http://www.worldbricks.com
is one of my favourites