Here’s a little tricky experiment that you can do on your own at home. It’s very simple to do, all you have to have is a solar battery (you can buy that cheaply from a scrap store), a bottle, a toy with wheels you don’t need anymore, and a little bit of super glue. It runs completely on solar power.
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How To Build a Solar Powered Car for Your Kids

Corgi H2GO RC Toy Fuel Cell Car Unveiled
The Corgi H2GO radio controlled fuel cell toy car has been unveiled that uses water and sunlight to provide power and zero emissions.

Co-op America's Recommended Ten Safe Toys for This Christmas
Not only are they safe, as in lead-free, but most of them are eco-friendly and educational. I personally like the solar-house. You're never too young to start learning about renewable energy these days.

Most Complete List of Toy Recalls On The Web
This is the most complete / comprehensive list of recalled toys I have seen yet. It is even more complete than what I found at the Consumer Product Safety Commission's own website. I can't believe how many toys have been recalled! My niece is getting socks this year.
8 Build Your Own Solar Powered Toys
a review of 8 build your own solar panel kits. Lots of fun with renewable energy!
Recycled, Handmade Toys
"Handmade toys from recycled and savaged fabrics. Recycled clothes, scraps and remnants make up the eclectic mix of fabrics used. They are chosen based on their visual and textural appeal, as these are important in stimulating the senses of young children and developing their knowledge of the world.
Being resourceful in the materials I use contributes in a small way to the environmental problems we face, as well as demonstrating that everything need not be brand new to be beautiful."