Remember the Bubbletree I'd had a happy accident with a lil while back?
someone had asked for a tutorial.
Well, it's not very elaborate, but for what its worth here it is..
#1. put lots of paint on the canvas. thicker the better. (image #1)
#2. select the palette knife with the edge option (2nd option) (remember Sabena's tutuorial?)
#3. Use the knife in quick circles ensuring that you drag some color over some non color area. (image #2)
#4. Viola, your own personal bubble-maker!
That's All Folks!
P.S. If the knife doesn't give the nice sharp edge, undo the stroke and reverse the direction of the circle. that usually works!