In partnership with Autodesk, in support of the sustainable Design-led Revolution, the Cradle to Cradle Products Innovation Institution has issued a design challenge
"to eliminate the concept of 'waste' by designing products with materials that may be perpetually cycled to retain their value as nutrients to fuel growing global economies."
To get started with the challenge, you must first complete the free, online course about Cradle to Cradle design principles, made possible by the Alcoa Foundation. Submissions are due by March 15, 2015.
If you won't have a design software of your own, you should try using Autodesk's free Fusion 360. When you are ready to get started, Take the Course.