stippling a blanket

I'm not sure what stippling is but I *think* you mean quilting (?). If that is the case you can freehand quilt with your machine by dropping the feed dogs and freehanding a pattern. You can also buy quilting machines (very expensive) or take it have it done by someone else (also pretty pricey). http://www.quilt.com/HowTo/MachineQuiltingHowTo.html

You need to drop the feed dogs and put on a darning foot... You can purchase those aftermarket at quilt shops. then just get loosened up and roll! I practiced a lot... and then on my first stippled quilt I still had to rip out some and redo it... I find a glass of wine helps and some good music makes me relax. I think it is more about the relaxation factor- as soon as I stress I screw it up.