Here's my previous theme (Breeze) which is based on the 960 css grid system. To install it, you just need to extract it on the right place. Navigate to site/build/themes to see if it was detected, also note that this theme only works for 6.x. 

And even if it was detected, the chances that it will display the way my blog previously look is a bit slim since you need to have the same blocks and some configuration the way I had it on my site. With that said, some administration pages will surely display the way you expect it.

I'm only uploading this so you could check it and see some stuff i did to build the theme. However, if for some reason you feel like using it, you can do so but you probably need to tweak some of it.