Designer Mike Clare (of my own alma mater, RISD) has extended the augmented reality mania (1, 2, 3) to baked goods. Thanks to the crowd and Josh Delcore at AR World for the find. Here's how it works, via Design Boom:
"The cookies are made with standard dough in two colours making it possible to create
a small grid for coding. The dough is rolled out and made into long square stripes that can be stacked into the desired configuration. Once all the dough is stacked it can be cut into slices and backed. The final cookies come out of the over ready to eat. However, once viewed through a digital camera they have a completely new life as AR markers. in this case, clare added a simple colourful asterisks on top, kind of like digital icing."
Perhaps a little silly, but fun. Demonstration below. Check out his site for full instructions.