This photograph of John Simon, an Australian black belt, is my current jiu jitsu "thought problem" for that amalgam of butterfly, Marcelinho, sitting guards that I've collectively referred to as my "Lotus guard."
From here, on offense, I like the Stuff Sweep, Poosh the Guy and the basic collar choke for which no clever name has yet been assigned ... Simon's "lazy passes", on the other side, are also worth working on--especially insofar as they resemble some of the stuff Rodrigo showed us awhile back about passing the butterfly guard.