All you need is Paper Foam, Two different Shades of Green, A Darker Brown and a Peach or tan colour.
Googly eyes are optional.
Paper Fasteners if you want him movable.
To make making a circle easier, you can use a roll of masking tape to trace out the body.
Two Sided tape, or a glue stick work excellent.
Step 1: Making the Base for the Turtle
Step 2: Making the Top Shell
Draw octagonal(stop sign shape) on the shell, this is optional for more detail.
Step 3: Making the Bottom Shell
Than take the lighter shade of green paper foam and cut a strip to separate the top from the bottom shell.
Draw a Grid type pattern on the shell, once again this is optional for more detail.
Step 4: Making the Head and Feet
Feet-Take the same darker Green, but this time trace your middle or pointer finger, draw toes if you would like, repeat this twice for two feet.
Step 5: Now Putting It All Together
Now take your Top, Bottom, and separator and tape/glue them over top of the base.