The church we used to go to (and are still "part" of, need to get on that...) sends out birthday cards with a "remember giving is good please donate to us here's a small envelope to do that", featuring a lovely watercolour image of the church (the watercolour is considerably lovelier than the actual building though). It's been the same picture since we moved here.

This last one we got we threw in with the paper waste without bothering to open the envelope. :P