My friends asked for a larger display. Using the same LED driver circuitry, I replaced the bi-color 8x8 LED matrix with two, single color (red), 8x8 LED matrices. The result is shown below.
(The case, bought from a photo shop, was designed for storing 4x6 photos. It has a hinged glass door, held in place with small magnets. It can be also hung on the wall (this has become an obsession, it seems :'())