Here are some examples of what you can do:
Take a sticker and put it into a greeting card. Scan it with the iPhone or Android app and record a personal message for the recipient. Then when they get the card and scan the barcode, your video will start playing.
Stick one onto a box and take a photo of each thing in the box. Now you don't have to open it to see what's inside.
Stick one onto a flyer and add videos and images of what you're selling.
Attach one to your business card and add a full PDF version of your resume to it.
There are thousands of things you can do with them. To learn more or add your own idea, go to stickybits [dot] com.