Get a white or clear case, preferably a snap on back case (not a flip case). You can get them on ebay for like $1 each.
Then, figure out what style and colour you want to either paint it or what to do to it.
If you don't have a white or clear case, paint over a different coloured one.
Paint it and customize it. NOW YOU'RE DONE! :)) follow and like for more guides :))
- clear or white phone cases
- any other craft materials
- paint brushes