I made a very fast, no-cook blueberry and kiwi granita last week. I love granitas because they are dairy-free and so easy to whip up. I blended a bag of frozen blueberries, a few peeled kiwis, a little cranberry juice, and a bit of sugar. I poured the mixture into a large, shallow baking dish, and put it in the freezer. Every couple of hours I scraped the frozen parts with the tines of a fork to make the granita fluffy. I kept doing this until it was all frozen.
That's it! If it is too frozen solid to serve, just let it defrost a bit.
I also made some frozen yogurt. I find that the frozen yogurt at the stores is too sweet and doesn't taste at all like yogurt. This is another really simple recipe. I buy really high quality Greek-style yogurt. If it's watery at all, I'll drain it in a sieve. I mix the yogurt with a little sweetener-agave syrup, honey or sugar, and some vanilla. I process it in the ice cream maker and store it in a plastic tub in the freezer. I love yogurt done this way because it is still tart, and not sugary sweet. The amount of sweetener you add is up to you.