Rebrickable is a new website that gives instructions on how to reuse your existing LEGO pieces to build other Lego sets and MOC fan creations.
The site asks visitors to enter up to six set IDs from kits they already own as well as how close they want the match to be (exact or close).
This information is then used to create a list of other LEGO sets that are possible to build from the already owned pieces.
Visitors can also enter the set ID of a particular model they want to build to see how close they are to being able to assemble it without actually having to buy it.
There are 9511 sets in the Rebrickable database including 569 fan creations.
See what sets you could build at Rebrickable.