I take a lot of photos of bacteria on my phone, and sometimes I use those pictures as my phone's wallpaper. These photos are meta-phone bacteria wallpapers: photographs of bacteria that I collected off the surface of my phone (h/t to Nick for the microbial inspiration). To sample the phone's microbiome I simply placed it on a plate of fresh LB agar and incubated for two weeks at 30 degrees Celsius. Click for higher resolution.