I use KDE/Linux for my workstation @ work and I recently changed 'themes', although I was very content with what I had (I was showing a MacOS user how easy it was to change appearances) and I left it on the latest change (a nice desert/orange/blue theme) and it's very nice. I gotta say - sometimes I find something, stick to it and never change, but this is quite refreshing. :) I encourage you to shake things up a bit with your UI, dust out those cobwebs, and give it a try. Gives me a fresh perspective and attitude. :)
Jason