A tip on macOSXHints shows you how to create a coloured signature in Apple Mail.

This only works, obviously, if you email in Rich Text.

In the comments, another poster links to the older macOSXHints tip on creating more complicated HTML signatures , saving them as web archives and manually copying them into your Mail folder.

Or you could follow this tutorial on inserting a graphic into your signature provided by a Skype user, but useful for any graphic not just Skype promos. (You could, but now it requires you to log on with a Skype account. Shame.)

It goes without saying that restraint and good taste are crucial in this matter. Don’t do this.email signatures, HTML, colour, color, mail.app, apple mail, signature generator, tips

Having described how Apple Mail users can create HTML signatures for their emails, I might as well point out the Gmail signature generator.

The generator is a free web-based utility that will create a graphic signature for you. You can then upload it onto a server and link back to it in your signature.

It features your Gmail user name and some completely pointless, bandwidth-sucking eye-candy, like this:

Oh dear.

(Why you shouldn’t use HTML email)

UPDATE: Advanced Signature Silliness for a further 20 email services including Yahoo!, MSN, SpyMac, AOL, etc, etc, etc.boofheads, bandwidth-sucking eye-candy, Gmail, signatures, graphics, signature generator