None!
I don't use patterns when creating my one of a kind quilts.
I hate using patterns. It drives me nuts and also is very boring to me.
I like to just start cutting, sewing, and slashing and sometimes cutting again, sewing some more. Folks around here seem to like my art. Its not something they would do and I guess are not wired like I am nor am I wired like they are regarding such. :-)