a year ago, pacman shared the 3d template for the collapse cover image logo, so we could use our own photos to make custom logos using blender. i've made a web app that uses his file, and now you can use your phone camera to generate the logo on the fly. try it here with your phone:
https://collapse.glitch.me
use safari if you have an iphone, or chrome if an android phone.
if you want to save the image you're looking at, just touch the camera view. i can't save it directly to your photo roll because of browser security, so a new tab will open containing the snapshot, then you can save/download it the usual ios/android way (as in, hold your finger down on the image).
many thanks to pacman.