Maybe so--but it sounds like more work than I'm up for. Golf balls would be about the right size, and used ones are pretty cheap, but the shape probably wouldn't work. Martin's light bulb suggestion is probably the easiest way to get close to the shape, and they wouldn't be too hard to attach.
Ruben, those "peaches" are pretty impressive, and they look like you could paint them fairly quickly once you get the hang of it. If I decide to try it, I'll need phony peaches, apricots, and figs at the very least.