I looked at the theme you had chosen and it was "Midnight" - for some reason, I believe that the working one is "Midnight [WIP]".
I thought Midnight was the finalized version?
The background image is just blue and always has been. (Also make sure you're using the ZFGC Midnight [WIP] one and not the ZFGC Midnight as the second one is just a mistake and shouldn't be there).