No, not that I know of, but paolammmartinez did this one which looks like smtg he might have done:

It’s not as elaborate as I would imagine his signature to really be though:

“… Lestat does everything in a big way-covers half the page with his magnificent lettering… “ – David Talbot, Queen of the Damned

witchyrem-ains adds:

I believe I read an article about illiteracy that said people who were illiterate into adulthood have far better hand writing than those who learned at a young age. I believe it’s because they valued it more and tended to treat it as a ‘gift’ or ‘art’.