You can click on "Build!", then select the Lego sets you already have, configure your obsession about slightly different parts (basically "the same, but there is a small variation in the newer part that no normal person would ever notice"), and it spits out all the Lego sets (official and fan-made) that you can build out of the parts you already have (and those that you can't quite build, but not much is missing – with direct link to Bricklink stores).