Artistic Endeavours

I turn to the grand Internet Mind for some brainstorming about a couple of projects I have worked on.

First: I need to take a picture representing "nothing". I'm mulling a few ideas, but am happy to hear suggestions from people.

Second: Anyone have some good ideas about who I should kill in 1492-1494 Florence for a noir-esque graphic novel? (Yes, this will involve echoes of the Pazzi conspiracy, but won't actually be about it.)