Improve our certificate of authenticity (keeping same content)

Industry: Publishing/Journalism
Design details: We publish high quality limited edition prints signed by celebrities.

We wish to improve our A4 certificate of authenticity and provide a more impressive, upmarket document that contains the same information.

Currently printing on 180gsm matt white paper

we have a new logo that we wish to incorporate.
Messages to communicate through the design: - Want to retain the current content including photo of the signer signing.
- like the idea of some kind of background watermark (not actually a true watermark in the paper) but a printed backdrop and could use a large version of the limited edition seal for this. Maybe off set or just part of it on the page.
-The only content we want to add by hand is the print number to the certificate.
Ideas for the visual style: modern/luxury (PREFER SYMMETRICAL)
Things to avoid: avoid oldey worldy old fashoned or period font
Urls to draw inspiration from: WWW.ORIGINALMEMORABILIA.CO.UK
Extra notes: would like 2 or 3 versions so we can choose one

May ask 2 designers to come up with ideas.

-Possibly could include embossing somewhere which can look good on a certificate (as long as it doenst make to much difference to printing costs)