Take a box of 72 crayons, which likely costs less than $3.00 to purchase, and make it into 36 Lego shaped crayons that you can use to fill your goody bags for your Lego themed
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LEGO Inspired Favor Bag Toppers - Free Printable
Lego Duplo for your Kiddo!
Lego Party Favor Crayons
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Free Printable Guess the Lego Bricks in a Jar
Lego Crayons- A Birthday Party Favor (plus free printable and other resources)
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The ultimate list of LEGO® party games - Chickabug