Since we're talking about Carmack in this thread.... Fabien Sanglard does some excellent reviews of code from ID... see for example:

http://fabiensanglard.net/doom3/

There's actually a movement that studies code in the way you'd examine a literary work (Critical Code Studies). Sure it's very abstract, but it can be fun, see for example this book:

http://10print.org/

You could also look at livecoding - they treat coding as a performance art. For example:

http://www.youtube.com/watch?v=GSGKEy8vHqg