Lego VW Camper Van since it came out a few months ago, as it combines two of some of our favorite things. It's a perfect Summer project. 1332 pieces and an afternoon later, we have our own mini Camper Van. The details to the kit are amazing- fabric curtains, an engine block, seats that fold into a bed, a folding table, operable windows. It's a pure joy to build. More pics on our flickr page.