Phillip Lenssen over at Google Blogoscoped has clearly got a little too much time on his hands, and decided to make some flags for the internet. With all the waving of the at the World Cup it seems apposite to mention it here; my personal favourite is this one, for the World Wide Web Consortium - "a highly accessible design on a beloved Netscape 3 gray background. The flag is still a draft and comes with an audio version for the sight-impaired".
Take a look and suggest a few of your own.