Quite a few years ago when USB was new, a trip to the local hobby store with about $3 cash resulted in a green model builders "paint pen" which is pretty much what it sounds like, a felt tip pen that releases paint. The paint dries out inside the pen after a couple years. I would imagine depending on your local graffiti problem these might be banned even more severely than spray cans, although in a civilized area they should be available?
Anyway the next discovery is I charge my phone face down to protect the glass, so I have to plug in upside down. Rightside up and Upside down connectors are commercially available for PCBs because the manufacturers have no idea which side might be up in a finished product. So you've converted the problem from figuring out which side of a cable is up, to memorizing which devices you own that have to be flipped upside down. Of course a dot of the same color paint fixes that although it might look ugly on a phone if done sloppily enough.
A greater annoyance is should the USB charger input be on the top, bottom, right or left side of all phones? I think I've seen it all.
Anyway the next discovery is I charge my phone face down to protect the glass, so I have to plug in upside down. Rightside up and Upside down connectors are commercially available for PCBs because the manufacturers have no idea which side might be up in a finished product. So you've converted the problem from figuring out which side of a cable is up, to memorizing which devices you own that have to be flipped upside down. Of course a dot of the same color paint fixes that although it might look ugly on a phone if done sloppily enough.
A greater annoyance is should the USB charger input be on the top, bottom, right or left side of all phones? I think I've seen it all.