ideas for guest book, maybe original idea?

You could have a polaroid camera and take pictures (to fill the pages)

Or you could set up a video camera booth and have each guest pop in one at a time and record a personal message?

How about a pic of you both in a frame that the guests can sign around it, you could have a smaller version of this:

My friend is taking pics of all the guests as they arrive then we're asking them to write their messages onto cards. We'll then stick the photos and matching card into a book x

I like these fingerprint trees, there's quite a few version available on Etsy: http://www.etsy.com/search_results.php?search_query=tree+guestbook&search_type=handmade

wish tree, guests write their message on a tag and tie it to a tree.

Meant to add we had a signing plate, similar to this

we got a couple of pens with it that you sign the plate with then fire it in your oven.

I bought one of these from etsy, I love it - be careful though I didn't think the cost of shipping was too bad but I got stung with an £12 customs charge, it would probably have been cheaper to get someone over here to print something up for me

We had a plate and a big picture frame canvas (with a square in the middle for a photo) for guests to sign - which we have since hung on the wall.

Love the picture frame idea!

makes my postcard look v dull and boring (now have 100 postcards with our wedding date on-if kate and wills choose 6th i may send them on and get me a picture frame!!)