Blend each fruit separately and then pour in bowls (strain the seeded fruit if you prefer). For a chunkier texture, you can mash softer fruits with a fork instead.
If you want to add any sweetener, then add it straight into the blender with the fruit. Start with 1/2 Tbsp per fruit and increase, to taste.
Pour a small amount of each fruit mixture into the popsicle molds. You can layer the fruit mixtures in any order you like. After pouring each layer, gently tap the molds on a surface to remove any air bubbles.
Insert the popsicle sticks in the center of each and freeze for at least 10 hours or until fully set.
How to store: Freeze the treats in the molds for up to 2 months. To reuse the molds, freeze them until solid and store them in air-tight bags/containers, making sure they're not touching to avoid sticking.
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Notes
Read the 'What to add' section for ideas of additional ingredient choices, sweeteners, creamy elements, alcohol, and more.
Blend the fruits whole and pour straight into the popsicle molds, or blend and strain for a smoother result.
If you want to add sugar to your rainbow popsicles, then I suggest using a natural sweetener like maple or agave. You could also use erythritol or stevia if preferred. Sugars help lower the popsicle's freezing point, which will help make it softer.
If you add creamy yogurt, you can create a lovely "tie-die" effect by running a knife up the side of the mold a few times before inserting the stick.
For a different style of natural healthy popsicles, dice/slice the fruit and add it to the popsicle mold and the liquid of your choice (e.g., coconut water for coconut popsicles). These will be "harder" popsicles and will take longer to melt while consuming, but they still look beautiful and taste lovely.
The total time does not include setting/freezing time. It's best to leave the lollies in the freezer for about 10-12 hours.