Sure, the best way to illustrate it is to simply show how the colors on the site change as you select different preset palettes in the picker.
It would be possible, but incredibly laborious, to selectively change the colors for each kind of element on the page manually in code. I'd love a way to be able to hijack the color palette itself with code, if that is at all possible.
The reason I want to do this, is the client is a property developer and they are beginning to add new developments which have separate branding (and associated fonts and colours) but they don't want to create a new site for each development. So I am finding a way to have the development represented in a single page with custom color scheme and fonts. I have the fonts sorted, but the colours are a pain.