We used the plan about using one sheet of plywood to make a closet organizer (http://www.ana-white.com/2013/03/plans/closet-organizer-one-sheet-plywo…) to make several shelves for our master closet.
We added a seating area with hidden storage, using an upcycled crib mattress for the seat (instead of buying new materials to make a seat cushion).
We added multiple wood dowels for the rods across. There is wood across the top of the whole closet system so we can store things up above.
This project added a lot of extra storage for us and we're so happy with how it came out. The shelves were pretty reasonable to build.