Queensland summers are HOT and if you're not eating sugar and processed foods, that means no ice cream or ice blocks to cool you down. But don't worry, I have found a solution by fiddling with a sorbet recipe. I just don't add the sugar, and I blend the fruit so that it keeps most of the fibre.
I just mix up any fruit that we have around, things like banana, mango, and pineapple are good, especially if I can get cheap orange or mandarins to bulk it out. Melon and mint is yummy too, I haven't tried berries (as they don't last long around here), but I would imagine they'd be yummy too. I squeeze and citrus and then I blend the other fruit. Mix it all up and put it in the freezer in a little pot with a lid. As long as you give it a stir every few hours, it won't freeze into a totally solid block. When you want to eat some, you just scrape off some of the fruity ice into a cup and enjoy. Sometimes I'm tempted to eat it all during the stirring steps when its a lovely cold icy drink. If you have an ice cream maker you could use that instead.