There many sites that you can create your own QR codes
Some links to make QR codes http://blog.qr4.nl/ or http://www.qrstuff.com/
Examples:
Here's two made from qrstuff.com these are website QR codes
Now you can link your twitter using either qrstuff.com or http://blog.qr4.nl/
Now here's QR Twitter Code from http://blog.qr4.nl
to make one just replace http://mobile.twitter.com/JeroenSteeman <--- with your username
now this is how it will look like
If you take your generated ^ twitter QR code from http://blog.qr4.nl/ @you can download a cool Twitter QR Code Business card template I found @ http://edudemic.com/2010/07/how-to-make-your-own-twitter-business-card/ be sure to download both fonts from http://twitterfont.com/ to make it like the Twitter logo with your name in the name follow that twitter font 2 says
Well I hope you make Cool QR codes using any of those Sites and for a bonus you can link youtube videos from http://blog.qr4.nl/ or http://www.qrstuff.com/
first here's QR4 - QR Code's youtube QR code
now here's Qrstuff's Youtube QR code
Well that is what I found on the net two cool QR code generator sites you can use.
