Here's a great idea for a Lego party invitation! We used 4 duplo size Lego bricks for each invitation, 1 in each color.  We stagger stacked them in a tower.  Using a label maker, we made a sticker for each one.  Together they gave all the basic information.  Our's read: Come build a birthday with Christopher!  Saturday January 12 from 11 to 1.  Your parents can pick you up when we're done!  Please RSVP 555-1212   Everyone loved them!