Here is my current effort at a Rainbow Loom phone cover. To make this I first did five separate ‘triple single’ bands, each using just one loom. Then I added basic chain sections at the top and bottom to go around the phone. Next I made a single band for each side and threaded it through the final loop of each triple single band to link everything together. This design uses 4 C clips and about 260 rubber bands.
To learn how to make a ‘triple single’, check out this video from the creator of the Rainbow Loom.