Could you please tell me about eco friendly christmas gifts for kids?

My 11 years old daughter is very fond of her cousin, who is my niece. Its going to be Christmas in a few days time, and my daughter is quite perplexed what should she gift her this Christmas as my niece has already send her an amazing gift. My niece is 13 years old, and my daughter plans to present something eco-friendly. I want to know from you guys about some wonderful eco friendly Christmas gifts for kids. Can somebody please advise me an appropriate gift considering her age? Thanks.