Voki is a site which allows you to create and personalize avatars with your own voice. You can make your "voki" look like you or choose different characters, animals, monster, anime, etc. After you waste tons of time creating your avatar and making it say ridiculous things, you can then embed the code on your blog or website (we're not saying you should, but it is an option you may want to avoid).

For Halloween, and since time is running out, Voki has ready made spooky avatars which you can email your friends. See below.