LEGO City birthday party supplies. The best boy's Birthday Party Ideas start with a great birthday party theme, so for a fantastic theme pick one of the most popluar themes ever, LEGO City, Fire and Police LEGO Theme. We have an amazing selection of LEGO City Birthday Party Supplies and LEGO Party Favours. LEGO City makes a great party theme idea for an amazing boy's Birthday Party! Have a party to remember this year with a super boy's birthday party theme featuring LEGO City! Great Birthday Parties start with Great Birthday Party Supplies!