Thanks for the feedback. We'll definitely disclose in it in the example and think of a more subtle way to help other people find out about it. We actually added it in at the end - that's why it is not in the picture example - and we thought it would be okay because you can delete the link once you paste the signature in Gmail. If people like this, we'll definitely consider spending some more time adding a few themes/styles, or open it up so others can create themes for it.