Dear God is an idea along the same lines as PostSecret and also (my own) i-confide. People share their innermost hopes (and fears) through prayer.
[youtube https://www.youtube.com/watch?v=aOHM2Qkt32o?feature=oembed&enablejsapi=1&origin=http://safe.txmblr.com&wmode=opaque&w=500&h=375] (Source: https://www.youtube.com/)