Micro Plants!

Pinky Tree is a tiny plant that lives in a 2” incubator capsule. It can be used as a key chain, a handbag or mobile phone charm, or as desktop decor.
The little plant will grow inside the capsule for 6 to 12 months. Once it outgrows the confines, you can move it to a real pot. It’s an easy process: Take the lid off the capsule and put the plant into a new pot filled with potting soil.
Pinky Tree helps the environment. For every four plants that are sold, a tree is planted in the US territory in partnership with American Forest.
Concerned about the Environmental issues, Weeplant has decided to contribute to the reforestation of our planet by participating into a worldwide program developed by the United Nations Environmental Program (UNEP). Parts of the company’s profits are reversed to American Forest to reforest the US territory (for each 4 Pinky Trees sold, a tree can be planted). (pinkytree)

I Love this concept and it could definitely be something aimed for children. Giving them something to care for like a plant would be a great way to help them save the planet and make them aware of environmental issues.