How do I access each list item uniquely through css?

I'm trying to add a margin in between list items, and in in the future change the background color of list items dynamically, but using the "Set CSS Style" event doesn't seem to give me access to the actual list items themselves, rather the entire list as a whole.

Am I missing something, or is this simply not possible?

Were you able to find a solution bowiz? Any ideas out there?