Give your error pages extra FAIL
A site I'm currently working has had boring and barren error pages. Until now!
I wanted some images from failblog.org to liven things up a bit. In a quick 20 minute hack, I took the site's rss feed, parsed it for the right content using Yahoo Pipes, exported as JSON-P, pulled that in with jQuery, and displayed a random image.
Here's the pipe I'm using:

The trick to pulling in Yahoo Pipe data via JSON-P is by adding a "_callback" argument, defining the callback function name.
The script:
jQuery.getJSON('http://pipes.yahoo.com/pipes/pipe.run?_id=0vxHL0Lo3RGc2uL8pQt1Yg&_render=json&_callback=FailImages&callback=?');
function FailImages(data){
var imgs = data.value.items;
if (imgs){
var url = imgs[Math.floor(Math.random()*imgs.length)].url;
jQuery('< img src="'+url+'">').insertAfter('h1');
}
}
And of course..
Demo page
I should point out this feed is not always SFW so use it as your discretion. This is more of an example of fux0ring with rss feeds and jsonpslamming them into your site. :)
This wins so much interbutt.