My wife and I wanted a changing table that could also function as a bookshelf, so after a quick Google search, I found the Ana White Ultimate Changing Table plans. I modified the original design by making the legs 36" and by adding side and back panels so that the piece could convert to a bookshelf when the baby gets older and we no longer need it to be a changing table. This was easy to do by using my table saw to cut 3/16" stopped grooves in the legs before attaching to the table and slotting in 1/4" plywood cut to fit before attaching the tabletop. Opted not to cut rabbets for the back panel as it would have changed the measurements for the drawers by recessing the rear 1x6 apron by 1/4".
My wife and I are very happy with the results and the amount of storage we now have. She's so happy in fact, that I will apparently be building one of these for each future child as well! Thanks Ana White for the straightforward and easy to follow plans.