Different background theme

Hello everybody!

I have to make a corporate website and looking for a wordpress theme where I can put separate backgrounds for every page. Not just like a slider that goes for all pages, but every single page has its own unique background. Left sidebar is also preferable. I thought it would be ease to find but it’s not. I didn’t see so far a single theme like that nor free nor paid. I’ve been searching for two days already. You can find lots of templates with slider in the background or designed extremely for photo portfolio. Please, if you have seen themes like that give me few links. And if you know approriate keyword for that kind of themes I’d also be very grateful. “Full-size themes” didn’t do me any good.