Spray a large metal mixing bowl with cooking spray and set aside.
Cook the marshmallows, butter, agave and 1/4 teaspoon salt in a medium saucepan over medium heat, stirring frequently, until the marshmallows are completely melted and the mixture is blended, about 3 minutes. Remove from the heat, add the puffed rice and stir to coat with the marshmallow-butter mixture.
Transfer the rice mixture to the prepared bowl and sprinkle with the apricots, flaxseeds and sunflower seeds. Stir with a wooden spoon or hands lightly coated with cooking spray. Form into 8 logs or balls (about 1/2 cup each). Let cool about 30 minutes, then wrap tightly in parchment or plastic wrap.
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Kids Warning: Note to parents: Never leave a child unattended in the kitchen. These recipes are appropriate for children of various ages, 4 to 10. When a recipe calls for cooking on the stove or using a paring knife, an adult should do those activities and let the child assist, if age appropriate.