If you believe you can make the case that the damage you caused to the walls constitutes ordinary wear and tear rather than damage that justifies a deduction from your security deposit, you can sue for that money in small claims court. Ideally you'll have photographs you can use to document the minor nature of the holes, and no provision in your lease that forbids you from hanging things on the walls.

I am not in a position to comment on what it means that the floors "weren't shiny enough". On the surface, no pun intended, that doesn't sound to me like a valid damage claim.