As I was perusing Etsy the other day I came across this fun idea and just had to share! 

April Ink Stationary Boutique is selling these totally funky guest book posters.  You can have them matted and the wedding guests can sign the matte as a great keepsake for the Bride and Groom.
If you know of a young, hip couple getting married head over to April Ink and check out the different styles!
Since one of my husbands best friends is getting married and I was looking for a fun, unique gift and they just happened to buy a house recently and are still decorating, I thought I would go ahead and give this a try (of course having a graphic design degree comes in handy here). I have access to a production quality Xerox machine, so I had no qualms about printing this on some quality paper! 
Mine is almost a direct knock-off, so I can take no credit (Krista, if you are reading this, DON’T LOOK!).
Disclaimer: I received no compensation for writing this post.  I thought this was a great idea and wanted to share.  I, of course, will not sell any reproductions that I created as it is not my original design.  If you want to purchase a poster, please visit April Ink.
UPDATE: The bride and groom LOVED their poster.  I made sure that each guest signed the matte at the reception and there were some amazing notes left for the special couple.  The poster is currently hanging in their living room for everyone to see!