Instructions
Buy a themed Lego kit. Many Lego kits are specially designed to build a specific structure such as a castle or pirate ship. These Lego packages come with instructions for building what you see on the box.
Pick up a large tub of random Legos and try building with your imagination. You can grab a handful of bricks and try to build something with just those bricks, or try to incorporate every brick in the tub into a large and imposing structure.
Build popular structures using Lego blocks. For instance, you can try building the Empire State Building or Eiffel Tower using Lego blocks.
Create an entire Lego town, building houses, streets, stores and other locations. Populate this Lego town with Lego police officers, firefighters and citizens.