I cooked up what I believe is an interesting little CSS effect which you can see on my home page. After having a delightful time playing with text-shadows in an unconstrained environment, I wanted to see how far CSS selectors would go.
The effect reveals some descriptive text when a link is hovered, all purely CSSey.
Here's a before and after of something that I put together with the photochop webappy thing that I put together. This one was created by reducing the colors of the image, blurring the result and applying the drawingify filter.
The drawingify filter takes the original image, blurs it, averages the result with the original image, then applies the photocopy filter and blurs that result. This generally gives a fairly convincing pencil-drawing style effect.
Seeing as this is mainly a test of HTML5's canvas element, it'll die a fiery death on internet explorer, but should work happily on most modern browsers. Savepoint averaging only works on Firefox 3.5 due to some awkward security settings on other implementations.