For the last few weekends, stone fruit has been spilling out of farmers market stands all around these parts. Last Saturday, we came home with a bounty of nectarines, plums, and pluots. Then I remembered a Sunset Magazine article I dogeared last summer with a recipe for nectarine creamsicles. Since I'm always looking for an excuse to break out the popsicle mold, I thought I'd give it a try.