You can build whatever it is you've got bouncing around your brain because there are 25 million bricks available to you. The winners will get to stay the night on November 24 when the LEGO House closes for the day to ensure all 25 million bricks are available to you and only you. You'll also get tips and tricks from a LEGO master builder, who can tell you that it's going to be very difficult to build an elaborate shrine to Lando Calrissian in a single night. But don't let that stop you. You can do whatever you want.