I just found this project, Inflated/Deflated, created by Jillian, Lauren, and Kady, based in Chicago:
“The words written on our balloons range from humorous quotes to heartfelt feelings and memories. These words are marked on the surface of inflated balloons, and like that of one’s thoughts being released, so too is the air of the balloon. Deflated the once largely marked letters become small, expressive, and intricate forms.”
Balloons are nice, their typography is cool, the idea is original, the result is for sure lovely!
You can also find them on Etsy and buy cool balloons.