Also an invitation to their wedding, if you still have one or at least a copy, can be a great introduction to the scrapbook.
There are also other good choices for wedding anniversary gifts.
These gifts are not always expensive, but they have to be meaningful.
For example a framed picture of the couple, personalized with some wishes or congratulations from you, can be very beautiful gift.
If you don't have a good suitable photo with the couple, you may use a cartoon photo, which may be sometimes more suggestive but also funny.
A personalized crystal or a silver glass set is very appropriate for this kind of anniversary.
The couple will create a lasting memory as they toast their wedding anniversary with these glasses.
Also some good choices are personalized doorplates, a map of the sky on the wedding night, wedding portrait platters, a bottle of wine as old as their marriage or a tree seeded in the wedding day.
Also if you know somebody that can help, you may come up with a personalized artwork with couple's faces instead of Adam and Eva or a personalized sculpture.
If the receivers of you gift have enough sense of humor you may buy them some gag gifts like book of making love or other funny things.
As a final conclusion, you have to keep in mind the fact that a wedding anniversary gift must be something unique and personalized in order to express your feeling better.
A usual present bought from a local store, with nothing written on it, can make the couple think that you bought the gift as this was a duty.