Using Flickr you can change fonts into a graphical graffiti extravaganza. Use it to design a different header or spice up a sidebar. It can be static or dynamic. But use it with discretion...it could become a visual nightmare! It is a little strange, in a 'crazed serial stalker' sort of way. But, none-the-less, it is interesting.
Here is a sample:
You can get your very own at FlickrFont if you have the inclination for the bizarre. Read more about it at Fresh FlickrFont From Feeds.