This guy has a whole bunch of websites that are each an individual art piece. I really like them because often they are a really fun and satisfying interaction.
The interactions are so simple and silly that it is at first hard to take them seriously. In the end though it is hard to stop yourself from using them because the interactions feel so good. The lessons learned from this art can be used to inform more “serious” issues of interaction design.
Here are some of my favorites:
And here are them all: