[all variants] Desktop Picture Mystery -

I'm having a problem with my desktop that started when sometimes after coming back from suspend there would be a desktop picture I haven't seen before and not the type I would download or choose myself. The picture's origin and location are a complete mystery. I first noticed them when I installed ubuntu-tweak from the PPA and everytime it comes up dconf-editor tells me that the desktop picture is the one that is supposed to be there rather than this mystery picture. When I try to change the desktop background via its preferences nothing changes. This time I restarted my computer to see if it will fix it after logging out and back in changed nothing and now I have no desktop picture at all. Just a black screen with the same symptoms.

I have also purged ubuntu-tweak from my system since so I am not sure if it originally caused the problem.

Also I have noticed that whatever is causing it is hijacking the picture at the login screen a tenth of a second after you see the original login picture. Checked my startup applications as well but there was nothing suss there either.

I have also logged into unity and the mystery desktop picture is there so the problem is not isolated to ciamon. I have attached the desktop picture.

So does anyone know what is going on here? Have I been ? How do I fix it and make sure it doesn't happen again? Please help.