[pendext]

I'd like to see a Piet program where the program output was the same as the 'code' for the program itself.

[nthitz]

http://mamememo.blogspot.com/2009/10/piet-quine.html unfortunately not very aesthetically pleasing. More from the author here: http://yusuke.endoh.usesthis.com/

[nandemo]

His quine relay is impressive:

http://asiajin.com/blog/2009/09/22/uroboros-programming-with...

[ygra]

And the Qlobe: http://mamememo.blogspot.de/2010/09/qlobe.html

[raganwald]

I'll add that as a sample program in the appendix.