The Japanese website DEZAEGG released a full set of awesome Shin Megami Tensei IV covers for sale for the 3DS, 3DS XL, iPad, iPhone and Android phone. The website is currently selling posters of four of the main characters as well.
The smartphone covers are called DEZAJACKETs and the 3DS and iPad covers are DEZASKINs. The covers include the main characters, support characters and the personal computer interface (complete with the navigational AI Burroughs on the iPad version). Naturally, there are different jackets for various models so you can choose whichever one matches your smartphone.