QR codes are 'Super-barcodes'. That doesn't sound interesting ... but it is - and it's an interest that treads that fine line between geekiness and nerdiness (xkcd comic).
http://www.makeuseof.com/tag/8-really-geeky-but-creative-ways-to-use-qr-codes-at-home/
qr_codes_at_home.png

QR reader
QR code

Here is an example of scavenge hunt


QR Codes for Trainers.mp4


QR codes: in one page
https://it-help.bathspa.ac.uk/onepage_qr_codes.html
QR codes.png
[QR Code] How To Use QR Codes video from You Tube



QR Codes - 21 Amazing Uses

QR Code Generator from the ZXing Project
Here is one created by me.
qr_code_Ian_hall.png
Press generate after entering all info
chart.png
Here are examples of what you can do?
  1. Calendar
qr_code_calendar.png
2. Contact information
qr_code_contact.png
3. Email
qr_code_email.png
4. Geographical Location
qr_code_geo_location.png
5. Phone number
qr_code_phone_number.png
6. SMS
qr_code_sms.png
7.Text
qr_code_text.png
8. url...web site
qr_code_url.png
9.Wifi network

qr_code_wifi_network.png