Looks like one of Jenny's Urban quilts.
eta: and so it is... Urban Abacus
http://sewkindofwonderful.com/
Most of her patterns revolve around her ruler....not a necessity, but it does make life easier.
and her fabulous blog:
http://sewkindofwonderful.blogspot.com/
Check out her FMQ on Urban Holiday - AMAZING:
http://sewkindofwonderful.blogspot.c...-finished.html