It would be great to see change.org implement a Dogecoin tipping app on their website. With such an app people could easily send Dogecoins (a cryptocurrency similar to Bitcoin) to petition starters and show their support not only by signing a petition but also by sending them monetary support.

Dogecoin with its open minded and charitable community (http://www.reddit.com/r/dogecoin/) and the Dogecoin Foundation succesfully supported some charitable projects like Doge4water and Doge4kids, therefore I think petitioners would benefit from such an app.