Skins for boards (a possibility to upload a bg pic)

Would you be open to create a possibility to upload a picture to the background to make some boards look apart? Ofcourse there´d need to be limitations so that the boards don´t get heavy, but something small, like max 150kb png?

Or if not that, then ability to skind the upper part, the title bar or so…

My case would be time attendance board, where I´d like to put a bg pic of a clock or something…