Change background color of preloader

Hi! This is very simple for preloaders without background, you just need to change tab in options page ( Settings -> Preloader SWS ) than look at Background color option.

But if you are talking about preloaders with preset background – this is impossible to do in WordPress. Gif file extension requires to change all frames. For example it is possible in Adobe Photoshop. After edition you can send me that new preloader, I can add it to plugin.