While I am not an Ambassador (and have no intention to become one) I got this idea from the Ambassadors Wall. One of the ways I see that wall is a big poster made from post-it notes (with various colors, shapes, orientation, written in different languages with different hand fonts) containing personal messages (they may be "real" - scanned, photographed or "fake" made with a graphic application, like mine).
As a natural continuation, it was logical for me to simplify it (and make it look even more childish) and reduce to the size used by our Promo Banners:
And if I am silly, why not go all the silliness way and do a custom t-shirt design (probably best suited for enthusiastic users)?
(everything has SVG sources available)