Letters, I found mine at our local Lincraft store. I used wooden fine letters, but after using them I realise it would have been much easier to work with the chunkier sized letters.
A storybook, I used a Golden book, The wizard of OZ.
Acid free glue, this won't mark your paper and will dry matte, you could also use PVA but it would be shinny.
A hard bristled brush.
First I ripped up the book, I picked the pictures I liked the most and tore them out leaving no straight edges.
I then played around with the placement until I decided where I wanted to glue the pictures.
I glued the large pictures first then worked on overlapping the words and smaller pictures. I also made sure I did the front of all the letters first while I had the most patience.
I made the word READ to go above our bookshelf, but these would look so amazing using your child's name.