While browsing through the backgruonds, it often happens to me that I first find one that I think is passable, and later try out another background which turns out to be worse. How can I get the previous background back?
Blair here from the Trello team.
I'm afraid there's not currently an option to revert the background selections, but I think it would be cool to see a section for recently used or favorite backgrounds. :( I would recommend to search for keywords that remind of you of that last background and see if you can locate it again in the selection menu.
I submitted a feature suggestion for expanding the background selection options on your behalf!