Base on Get Skeleton Grid : http://getskeleton.com/

16 columns / 55px columns width / 10px gutter

I added style for 1200px width. So you can design for wide screen. If the screen is less than 1200px, it's take the original size. (960px).

Simple!

The .atn create the guides.

1. Create your psd in 1200px.
2. Run the .atn
3. Resize your psd if you want. (ex: 1400px)

I created the sass file for people who code in sass. You only need to import the file in your .scss. (ex: @import 'skeleton1200';)