From the Crowdsupply.com site:
"Circuit Stickers are electronic stickers that you can use to build glowing, sensing, and interactive projects without any complicated equipment or programming skills. All you need is your imagination.
Building circuits with them is fun and easy -- just stick them onto a surface like you would with a normal sticker, and build up a circuit by sticking several stickers together and adding a battery. They’re an approachable way to learn and create electronics through craft, whether you’re just starting out with circuits or creating complex interactive artworks.
LED Stickers are simple LED lights available in white, red, yellow and blue. These come with every starter kit!
Effects Stickers generate an effect to control your LEDs (or other output!). Current effects are blink, fade, twinkle, and heartbeat.
Sensors Stickers include a light sensor, a microphone sensor for detecting sound, and a timer circuit that turns on your circuit for five seconds at a time.
Touch sensor/Microcontroller Sticker comes set up to work as a touch sensor, but advanced users can program the onboard ATTiny85 microcontroller to do anything they want.
Circuit stickers are light, paper-thin and flexible circuit boards cut into small, fun shapes with anisotropic conductive adhesive on the back. The adhesive sticks to most surfaces and can be used with virtually any conductive materials as “wiring”-- such as conductive threads and paints or even wires and aluminum foil from your kitchen.
We provide a roll of copper tape as a starter because it is easy to use and sticks virtually to anything. It's also very soft, conductive and solderable, so you can make the circuit as big as you want. If you run out of copper tape, you can get more at your local hardware store in the gardening section-- it's normally used to keep snails and slugs out of the garden!
You can re-stick Circuit Stickers a few times, just like regular stickers. We also provide extra anisotropic conductive adhesive to "re-sticker" old stickers. Advanced users can also solder to the stickers for more permanent works."
Sounds like a wonderful way to combine papercrafting and simple circuits, among many many other applications. I can't wait to preorder.