I saw this fab tutorial on Jo's blog.
Normally I struggle with measuring and cutting but these were easy to make because the instructions were nice and clear and simple.
The only change I made was to use ultra-sticky double sided tape instead of glue. If I use glue I tend to get it everywhere and normal ds tape will result in everything dropping to bits a day or so later!
The small bulldog clips are by Making Memories but you can bulk buy unbranded ones on Ebay.