I couldn't find any Mac-y themes that felt right in Ubuntu. Trying to emulate everything from Mac OS in other themes hasn't worked from what I've seen. So this is the theme I hacked up and thought I'd share. It's basically an edited version of the DustSand theme with custom window buttons I edited specially as opposed to trying to copy Mac OS as much as possible.
If you don't know how to change the window buttons with Ubuntu Tweak or a Desktop Settings thing, do...
alt+f2 and run: gconf-editor
-Under apps-metacity-general, change button layout to: