Create a Lego cake by using a 9 x 13" pan and place 2 cupcakes on the top. You can collect a variety of boxes, have your children paint them, and turn a playroom into a large Lego land! If the weather is nice you can create an obstacle course with the boxes. For gift bags you can give small packages of Legos. Have a variety of Legos on hand for the children to create with during the party.