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I can't find where in Concrete5 Version 8 where to change the back ground colors and the Page Peak Parallax images??
I'm going to need to find out the revised code for this, then apply this to the theme. I'm starting to get very frustrated with the lack of forewarning or updates regarding functionality changes coming out.
I'll update you later today once I've had a chance to investigate this.
Update shows in Extend menu and now Customise shows in Design Menu under Cog. The interface for editing is a little different now but you should be able to figure it out.
I'd recommend uploading your new background images first through the file manager so that you just see them in the list when it's time to edit the background images. It seems to be a little convoluted with having to click in and out of things by doing it directly through the edit theme section.