Any ideas to fill the pages for this book?

My grandparents 50th anniversary is coming up next week, and my family decided to make a small 28 paged book. Just to like celebrate it and like show our love. So far the cover is done, and we know that in the back of it were gonna use 10 pages (one for each of the blood relatives) to write a letter to them about anything we want to say to them. Also, the first page we will have a picture off them on there wedding day. So that leaves 17 pages. What should we put in the last 17 pages? I was thinking maybe like put pictures of them together over the years, like on vacation or something, but there isn't a lot of those. Or we thought maybe we could like put famous love quotes on each page, but thats kind of boring. Are there any ideas? Things you may need to know: The wedding theme color was green, and they had a lot of white daisies around (the ones with white petals and a yellow center). At the party, there will be 18 people, but some people aren't really like blood related and don't really know them, so there not gonna write a letter or anything. There are only 9 of us that will be writing a letter... Please help! Thank you!