Robin Good: If you are looking for an easy and fun way to generate and customize your own QR Codes, QRhacker.com provides a simple interface just for this.
With QRhacker.com you can decide whether your QR Code is a text, a url, a phone number, a VCard with your contact details or a gateway to provide WiFi access.
You can also customize the background and edit each individual pixel of your QR code any way you want.
Once you are done you can save and download your ready-made QR Code and start sharing it with the world.
Try it out now: http://www.qrhacker.com/