We developed a new simple but useful processing library that we would like to share with the community. 

The ScreenCapturer library for Processing enables you to capture any part of your screen and include this capture into your Processing sketch as image or video.

https://vimeo.com/50598706

The fact that you can easily recapture and manipulate a captured image allows you to create interesting optical feedback and interface glitches.

https://vimeo.com/50518928

You can see the library and feedback loops in action as well as download the library here: 

http://www.onformative.com/lab/screencapturer/