I saw this on the net somewhere (if I remember where or I can find it again, I will post the link) but the one I saw was made up of post-it's. With the rate at which my girls manage to destroy things, Post-It's would never have lasted longer than 5 minutes, so I decided to make something a wee bit more sturdy.
To make this workbook, I used an orange file folder, self adhesive plastic, templates (laminated), self adhesive velcro strips and double sided tape.
I covered the orange file folder with the self adhesive plastic on both sides to make it sturdier and hopefully last longer. I then laminated the template pages and stuck to the folder with the double sided tape (not the thick puffy tape). I laminated the colour letters and cut each one out to fit onto the template. I then used the self adhesive velcro to attach each letter to the template so that they can be easily removed and placed back. In the "Make a Word" section, I placed a long strip of velcro so that the letters can be moved to build words.