I'm conceptualizing a Drupal 7 custom module and I have a logic to show a class (with an image of red carpet) only at morning, then at noon (around 6pm) the class image will show another image (like a blue carpet).

What particular Drupal 7 hooks should I use for this module and properties? The only hooks Iknow to use is hook\_menu and hook\_block but Im still thinking how what exact hooks should be use..

Thank you. I a week young in module development :-)