Awesome favor-baggies. Pick up the small ones at the dollar-store, and cut cardstock circles out. Use foam sticky-dots to make the circles stick up like legos! (If you were really feeling ambitious, you could even print "Lego" onto the paper before cutting the circles!) I've seen Lego-lookalike candies at Party City - it's been awhile, but MAYBE they still carry them?!?
Realistic Building Blocks Birthday Invitation/Colorful Party Invitation/Children's Birthday Invitation/Lego
Home made crayons using Lego man mold - "I bought a few boxes of cheap crayons, soaked them to get the wrappers off easily, and then broke them into 5-6 pieces to put inside the mold. Then just put them in the oven for about 10 minutes to melt. I only needed one crayon per mold for these. I placed them in candy wrappers bought at Michaels and made an address label as a sticker to close them up."
Free Printable Blank Lego minifigure. Could be for science safety gear, weather clothing, what people wear around the world, descriptive words and their matching expressions, how does it make you feel, etc.