I designed some Justice League themed phone backgrounds. From left to right: Aquaman, Batman, Green Lantern, Superman, Flash, Martian Manhunter, Wonder Woman.
If you like these, you can download them from an imgur album here. These were designed for the Samsung Galaxy S4. These may work for other phones, but your mileage may vary.
If you guys want me to make Lockscreen versions of this, let me know.