I wanted to freshen up the look of Reaper since it's the main DAW software I've been using for almost a decade now. I didn't realize some of these themes led to improved functionality as well.
Here's a link to the Reaper themes database:
REAPER | Resources
Here's a link to my favorite one so far, LCS-Mod Short Edition:
LCS-mod Short Edition - Cockos Confederated Forums
There's also this gorgeous one, White Tie Imperial, if you're running two or more 1080p monitors. Don't use it if you're not doing that though, as it totally screwed up my view on my single monitor machine.
White Tie : Imperial - REAPER theme for large monitors
Here's what I wound up going with for now, the LCS-Mod Short Edition and this is what it looks like on one of my sessions. I think this looks badass, and runs perfectly in the newest version of Reaper: