Nokia are pushing their green ambitions again, and this time are looking to the public for ideas that can help the environment and be used in the mobile world. Come up with the best mobile eco idea, and you could win an example of eco-mobile in the form of a Nokia 5630 XpressMusic device.

You can enter using a nifty “storyboard” tool in the comments over on the Nokia Conversations Blog. Entries so far include using solar power, converting flash videos to Mp4 to reduce CPU usage; package a dynamo and handle in a new phone and always close an app not in use to save power.

What will you come up with? And can you come up with it before the closing date of April 30th?

As well as the hardware, the winner, along with a selection of other ideas, will be turned into a professional video to air on the Conversations blog.

Find out more and enter at Nokia Conversations.