Last year, NASA thrilled the world by sending a small robot vehicle to Mars and showing us close up pictures of the surface as it explored a field full of rocks. Sojourner was a small and relatively inexpensive robot, powered by solar cells and "D" size batteries. Obviously, this is something that can be replicated in LEGO® blocks!
Plans for building a LEGO® ant.
Pictures of a LEGO® centipede.
Pictures of LEGO® Christmas models.