I have created a QR code activity on Nebraska 150th. Students would listen to 150 Video and summarize, search and then draw an image & answer 2 questions related to Nebraska (they can choose from various QR codes to find the answer).
The product has 14 different pages. I plan on 5/6 working alone (2 students would have same sheet) while 3/4 would buddy up. I am working on simple version for K-2 but haven't completed it.
You would need iPod/iPad with QR reader.
If you see something wrong or want to add piece let me know.