This is pretty rad - stationery design (by Bureau Rabensteiner) for a rep and photo producer in Vienna using thermo sensitive black inks. When it comes into contact with body tempuratures the ink fades - thus producing a temporary "photograph" of the user and creating an interactive and memorable experience. See and read more here.
Here is a sneak peek of my temporary business cards that finally came in! So excited! Got them printed at Overnight Prints. Not to sound like an endorsement but I am thoroughly impressed with the quality for such a reasonable price, and their customer service is awesome.
image taken with my iPhone and edited with Instagram