The Leaf is a service you can use to scan your bills using your smartphone to show how 'green' your purchases are. It also helps you keep a record or your purchases.
The service provides an interface to quickly scan bills on the go and also allows you to go through your bills on a monthly basis.
This is a paper-cut low-fidelity video prototype that we used as a storyboard in the Video Prototyping class in Copenhagen Institute for Interaction Design. Feedback to this was used to create the high-fidelity video here: vimeo.com/42609463