QR Code Generator
Just enter the url and click submit. Once the QR code is displayed, just hover over the image and "right click" on your mouse and choose "Save Image As". This will save the QR code to your computer. Check out the decals and magnets you can create with your QR codes on them.
QR-Code Generator by Mobile-Barcodes.com
If you want a truly unique and custom QR code, check out QRlicious.com