MorphThing "morphs faces: give it two people and it'll combine them, to create a new person with the facial features of both."
Without registration you can have a play morphing the celebrity photos supplied on the website. Registration is free and this allows you to upload and morph your own photos.
You can even include a "morph me" button on your website/blog that allows your readers`
Be sure to read the "Good Image Guide" to ensure the best Morph Experience!