Jean sent this fantastic envelope in response to envelope 100.
I have no idea what pen she used to make the large letters, but the strokes have a great even weight to them, and the edges look almost as if they've been outlined (I assume that this is a quality of the pen). Love how easily she made the address stretch across the entire length of the envelope.
The thought bubble is extremely cool, I've never seen anything like it. This envelope is the best thing to drop through the letterbox in a very long time. Jean blogged about it here.