Things You'll Need
Instructions
 
Look for Lego's Extra Large Gray Base Plate ($10) or the Large Blue Base Plate ($6). These are excellent for forming a solid base for large building projects. 
Add a little life to your Lego collection with the Town Folk set ($6), which includes a fire fighter, pizza chef, construction worker, cat, bicycle and jack hammer. 
Create road systems with Road Plates ($7 for two), or create an entire community with the Build-Your-Own Playmats ($15 to $40), which feature landscape-printed foam mats that can be assembled in many combinations. 
Get the Lego Classic Bucket ($10) if you just want more bricks. This set comes with 400 pieces. 
Check out the Lego Idea Book ($5) for directions and pictures of all the fun things you can make.