This idea and code comes from the interesting work of Joe Gregorio
You feed this utility some data, and you'll get a lovely inline sparkline plot like this
This is useful for quickly displaying a lot of data such as the results from regression testing.
NOTE This method of displaying images in the URI does not work for IE users, please upgrade to Firefox.
If you like the concept of embedding images in a URI, you should check out this utility which lets you embed any image in a URI
It turns out the author of the code had already made a sparkline generator. You may want to compare the two.