Subtheme or Functional theme?

Hi guys,
I am going to develop my personal website. For my website, I got some idea to make it. Here is some example.
Home Page: black color background/similar background image.
Project Page: white color background/similar background image.
Media Page: Yellow color background/similar background image.
and so on.
However, the post that under those pages are inheritance from their parent.
the whole template remain same. Just different Big topic(category?page?) changing the color/background image.
Can anyone tell me is that possible to do this? Is there any theme can do this? or I have to do subtheme?
Thanks for your time.

Ming