As a huge Simpsons fan, this is possibly the greatest thing I have ever found online. The official Simpsons Movie website has a fantastic Avatar creator that allows you to create your very own Simpsons Character.
You can fully customize your Avatar, all of the usual elements, even down to the colour of your trousers and what t-shirt you wear.
If you are a Simpsons fan like myself then I am sure you will find this as brilliant as I did!