I find the decorative edges with buttons for altered books really beautiful :)
In the case that you cannot see the pictures in the instruction, you can look here.
Links:
Decorative Edges with Buttons for Altered Books (Lesson 15: Decorative Edges)
via: 23 Easy To Make and Extremely Creative Button Crafts Tutorials – 3.) Creative decorative edges with buttons
See the page at webarchive: Lesson 15: Decorative Edges