Up for a green challenge for the fall? Try entering one of these three contests, both for simple eco-fun and for a chance to win green prizes:

4030460260 26d7f5d7cb m >> Create a costume for the Inhabitat Green Halloween Contest! Just submit a photo of your “one-of-a-kind, green-themed, DIY costume” into Inhabitat’s Green Halloween Costume Photo Contest for a chance to win a solar-powered Bogo flashlight, a $100 gift certificate to the Inhabitatshop or other Inhabitat goods!

Need ideas to get you started? We’ve got tips on creating your own green Halloween costumes — and one for your dog while you’re at it!

>> Submit a fair trade recipe and win a basket of fair trade goodies! Alter Eco’s putting together a Fair Trade Community Cookbook — and wants your help! The top 10 rated recipes will win their creators- an Alter Eco gift basket. Even if you don’t have a recipe to submit, you can still browse Alter Eco’s submissions to pick out a recipe for your next socio-conscious meal.

>> Win an eco-reality-show-meets-social-media contest for internet fame. Make a short video to enter The EarthCare Challenge for a chance to be picked as one of six contestants who’ll compete via a 45-day Green Makeover! The contestants’ greening efforts will be put on Facebook, Twitter, Flickr, and EarthCareInside.com — where anyone can follow the contestants’ progress and vote for the winner. The grand prize winner gets furnishings from Hickory Springs.

Image courtesy of Inhabitat