http://color.slightlyblue.com/
What you do here is select a colour and it finds a bunch of photos on flickr where that colour is The Main Thing. Fun for about 2 minutes.
Found this great one there though:

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http://www.onemorelevel.com/games/avoider.html
What you do here is try and keep your cursor out of the clutches of that insane little guy.
Fun for ever.