HTML Email Signature with Embedded Image in OS X Mail

I accidently figured out how to create HTML signatures with embedded image in OS X so here's a tiny tutorial to show you how it's done.

1. Create your HTML signature and embed the image.
2. View the HTML signature in any browser.
3. Select all (command + a) and copy (command + c)
4. Open Mail -> Preferences (command + ,) -> Signatures tab -> Create a signature (+ below the second panel)
5. Paste (command + v) in the signature panel (the third panel).
6. To add a signature to an email account simply drag the signature into the email account (from second panel to the first panel).

Too easy :]