If you have been blessed with a digitcal camera and has captured quited enough moments to pring the pictures, then you can make your own wedding photo book for the couple. Once you have found the right book to paste the pictures, print a big one for the cover and laminate it for lasting effect. If the front is all about small pictures or thumbnails as cover, look for a big one for the back portion. You can arrange pictures by year per page so it would look like a story book as well for the couple.
The newly weds can use your gift as a guest book where all the guests who attended can sign and share their well wishes. This kind of gift is not expensive but very useful. Just choose the right materials and a good keeping box so that it can be preserved.
Such gift can be given on the wedding day itself so the couple can use it for guests messages and signatures. This becomes a wedding book with all the wonderful moments that transpired during the wedding.
After you are done with your friends' wedding photo book, why not create one for your own use. Photographers often do not include all the photos they have taken during the wedding, you may ask him which pictures were not used and get them instead for your own wedding album. So that you won't have a hard time decorating the photo book, you can look customizable ones online.
To help the couple worry less of some minor details of their wedding, volunteer to make the guest book for thems. The guest book at present time is personalized with the couples pre-nuptial pictures. What's good about guest books or photo books is that you can add more pages if needed.