Jishnu is a fork of Arjuna X, which I plan to release by the end of this month (Jan 2013). Not only is it now WordPress 3.5 compatible, but I have also slimmed it down immensely on the front end - it now uses only 1 image (which is under 5KB). Everything else is now generated by CSS. In addition to being lighter on the front-end, it's far more customizable on the back-end. Here I show some of the customization available in the theme.
A big thanks to SRS Solutions for creating Arjuna which Jishnu is entirely built upon, and to Otto ( http://ottopress.com/ ) for his fantastic write-ups on the WordPress customizer.