I don't normally use character backdrops. I'm creating some pre-mades for my campaign, and I thought backdrops would be useful to set the tone of the character.

Looking through the scores (!!) of character backgrounds that I've accumulated over the years, I found only a few that involved water. I was hoping for a stormy seas backdrop.

First, whoever's looking for useful backdrops to create... How about a series of watery pictures?

Second, what's the trick to upload my own images? 

There's no uploading of custom backgrounds, unfortunately. I'd like that ability too.