Our webdesign consists of a fixed design with a fixed logo, fixed sitetitle, fixed structure and fixed colors, but the header image or key visual we use within the head of the page should change depending on the page which is shown, e.g.

• random image: each page shows the header with a random image
• category image: each page has its own header image depending on the topic which is shown for the page and all sub-pages
• category and subpage image: each first level page (category) has its own set of images, sub-pages show a random image from this set in the header

Which of these can be done with core or free DNN modules or some developing?