I don't have a recommended recipe (I'm not big on smoothies and haven't tested this out) but there are heaps of recipes out there depending on what you have.
Apparently using full fat coconut milk or Greek yogurt helps the icypoles stay a bit softer, as will adding cornstarch, and blending in pre frozen fruit.
You could even chuck some protein powder in and have a frozen smoothie on a stick for dinner when it's too hot to cook.
The freezing container is a bit awkward without dedicated equipment but depending on freezer space you could freeze it onto teaspoons in small cups or muffin tins.
Or freeze it as small icecubes and blend it again into something thick and semi-frozen like soft serve or a thickshake. Make sure your blender is up to handling ice though. I'm not liable for puffs of smoke.
Ps. Yogurt by itself is also ok to freeze this way. Warning: It's kind of hard so you might have to chip at it slowly, and the texture will change into something gross on defrosting though. At least Greek yogurt did when I ate it. It doesn't freeze smooth and soft like froyo from the shop.