Something like this:
1 (text)
2 (text)
2.1 (category-image)
2.1.1 (standard image 1)
2.1.2 (standard image 2)
2.1.3 (standard image 3)
2.2 (category-image)
2.2.1 (standard image 1)
2.2.2 (standard image 2)
2.2.3 (standard image 3)
2.3 (category-image)
2.3.1 (standard image 1)
2.3.2 (standard image 2)
2.3.3 (standard image 3)
...and so on.

Is this even possible in CMSMS?
Edit: I must confess I'm not really that PHP-savvy, so if it's PHP-related please be gentle
