I plan to harness that magpie impulse for easy lessons in the Craft. I am going to give him an altar space at his level. This altar is his- he can put anything upon it that he finds and loves. Because I am already showing him things (and taking him on outings that are seasonably appropriate for where we live), the altar is shaping up to be one that changes with the seasons.
There are other lessons for him to learn about the items that he selects- as he gets older and begins to understand me and abstract concepts more, I can tell him that the rock he just picked up is quartz, or the feather he found is from a scrub jay. We can look out for that bird so he can meet one. He can learn to ask a plant before removing a leaf, flower, or fruit from it, and to leave an offering in return. He will also learn to listen to see if the answer is no.
When Rowan gets older, I hope to find a good woodworker who would be willing to make him altar tools out of wood (a cup, athame, wand, and pentacle) so he can practice what he sees mommy and daddy do in ritual. But that will come later (and I haven't found anyone to do so yet, anyway!). For now, it is enough for him to have natural items on his altar.
How do you share the seasons and the turning of the wheel with your children?