Rated 4 out of 5 stars
I very much like this. I don't know why Mozilla is making the default so much like Chrome. I'd give 5 stars if there was an option to turn off the gradient effect. I'd rather have it one solid color tone.This review is for a previous version of the add-on (22.214.171.124). This user has a previous review of this add-on.
As far as I know themes cannot have options; however feel free to customize the design as much as you want, you can add an userchrome.css file, see http://kb.mozillazine.org/index.php?title=UserChrome.css
For example you can change the background of toolbar and menubars with:
background: #EEE !important;