Possible centerpiece idea. Tie balloons to current vases Balloon Centerpiece using mason jars.like this idea you can fill the jars with whatever you like - Candy for kids, shells, colored marbles, flowers, themed items. A Good idea to shelf.
Lego party- food ideas- jelly cups, theme coloured m's, themed cookies, all very easy and can prepare early so you arn't running around the morning of the party! I think I can tweak this to be mine craft?