EDIT: Talked to my co-workers. There's an 'advanced' section in the module parameters that allows you to force a class to essentially do what I was trying to do.
I need to individually style the .rt-block's within 3 different div.rt-grid-3 elements. The problem is that two of these blocks hold the same inheritance set, so I can't individually style them.
#rt-mainbottom .rt-container .rt-grid-3 .rt-block .rt-module-surround{}
/* this influences two blocks the same way */
How would I influence gantry to throw this set in my div.rt-main-bottom (it's set to four modules):
<div class="rt-grid-3 rt-alpha example-1"></div>
<div class="rt-grid-3 example-2"></div>
<div class="rt-grid-3 example-3"></div>
<div class="rt-grid-3 rt-omega example-4"></div>