Hi @ChrisTERiS
I am happy to assist you.
Such images are located under the "/templates/website/[ThemePath]/images/" directory. The name of the footer bg image is "footerbg.png".
Follow the path "Settings > Staff > Departments".
To change the background colors of the pages, you need to give the body a style. If you don't get the look you want when you do this, we recommend working with a FrontEnd/CSS expert.
If you require any further information, feel free to contact us.
Kind Regards.