If you only knew the power of the dark slide
A dark slide from Polaroid-compatible instant film sold by The Impossible Project.
The Impossible Project decided to use this otherwise-disposable cardboard card as a opportunity for creativity. In their words:
Basically the darkslide is a purely technical necessity, protecting the film from light as long as it is outside the camera. Impossible is converting the darkslides in collector cards by transforming them into an area to present art projects. On a regular basis we will invite artists to develop refreshing, creative and inspiring content that turns the Impossible Darkslides into unique pieces of art.
You can see all 123 dark slides here.
Images from The Impossible Project.