Raise your own Tilapia. The species is well-suited to container farming. Tilapia are not only easy to breed, they are also very efficient at converting food and they grow quickly. Lots of tips in this interesting article.
Vertical Succulent Garden by floragrubb: 20 x 20" panels with 45 slanted cells to support planats and soil when mounted vertically. The unit in the picture is made of 6 panels, each $79. Now, if I could only figure out how to make the panels myself..