default skin background change?

Hi everyone dont know if its the right place to post this but does anyone know if its possible to change the background in the default skin? Really like the default skin this year but much rather have a plain dark background, thanks if anybody knows how to do this.

somebody could compile default with sidebar mod / instant result / background selector and bigger player photo mod ...

I'm struggling to find a basic guide to adding a background selector to a skin or like you say a default with just some of those basics that can then be taken to build own skins.