Wikipedia vandalism as an artform? It's been done, believe it or not. The Wikipedia Art website was originally founded as a collaborative performance art project, but has since grown into something much, much bigger.
In a nutshell, it now consists of a glorified piece of 'vandalism', which saw the site itself attempting to gain its own Wikipedia entry 'playing by Wikipedia's rules'. I won't explain too much more about it here, but you can read more on the project and the wonderful hilarity of it all in the links at the end of this post.
For the most part, it has slipped under the radar with the mainstream media, but Jimbo Wales has come out this week to publicly slate the project and announced his intention to bring legal action against the site for using the Wikipedia name.
This automatically makes the project wholly worthwhile in our eyes. After all, we all loved to goad the headmaster at school didn't we?