There are two upcoming GWC sessions that cover patterns in PureApplication System:
June 13 at 11:00 AM EST: Amit Acharya presents "Empower your application lifecycle with new PureApplication System v1.1 features"
June 19, 2013 at 11:00 EST: Andre Tost presents "Demonstration of pattern building for PureApplication System"
These sessions are free to attend. You can register on the GWC website.
If you're not able to attend the session live, you can listen to the recording. To access the session recordings, go to the Recent Archives tab on the Webcast page.