Assign multiple banners to your website that will change based on the day of the month!
Anything from 1 banner up to infinity (but seriously, a month can only have 31 days... ;) ). Not enough banners to change every day? That's ok, the plugin will loop through the list again, starting from banner number 1 again and keep going. That way you can switch between 2 banners alternatively, or 31 different banners, with a different one each day!
On top of that, you can also change the forum title every day displayed in the banner area - if you want to! Not assigning one will keep it to your default name.
The plugin literally just changes the image for the background of the "banner" div - which is where the image is located by default. You can then continue to change other properties through ProBoards' default functions and features.