Just installed VS 2013 (was previously on 2010) and I deeply regret it. I'm so glad the company picked up the tab!
I've read around a bit and found that a lot of people hate the VS 2012/2013 look & feel, and there are tools and tips to bring back the 2010 look & feel in VS 2012. However I couldn't find something like that for 2013 and wondering if I missed it or it just wasn't invented yet.
Edit: Two things I did find which someone else might be interested in too:
- Disabling the ALL CAPS menus (this is is another SO question and found easily)
- Disabling the file contents expanding (this appears to be less known and god knows how this guy even found it...
Edit #2: In the end I didn't use the themes in the provided answer. It seems that the "close to 2010" theme comes built-in in 2013 under the "Blue" name. I decided not to bother with icons and colors beyond that, to try and get used to these icons. The hacks above, coupled with VSCommands proved sufficient for me.