There is an older thread still extant about this - of which this is in effect part 2, but with some overlaps.

Here is a post I made there, repotted here:

I suppose a conman is a kind of artist.

Some suggestions for future Turner Prize awards -

a queue with a pickpocket;

a toilet that plays "God Save the Queen" when you try to sit down on it. It'd work better when it gets to New York, and it's adjusted to play "God Bless America", sinc epeople are perhaps more likely to feel like standing up for it;

karaoke for solo conductor;

a dead rat on a plate for as long as it takes for it to turn into a swarm of flies and a skeleton.