Step 1: What do you need?
So, you'll need:
Three different coloured papers
A piece of wire
A necklace (or just string, whatever you prefer/have)
Step 2: Making the modules
After folding them, all you need to do is one extra fold, a diagonal fold from the bottom left corner to the top right corner.
You'll need to make twelve of these modules.
Step 3: The first corner
Putting the model together is easiest to follow by looking at the pictures.
Start with putting the corner of the dark green module in the pocket of the light green module. Take the white module and put it's corner in the inner pocket of the dark green module, the inner pocket had been marked on the second picture.
To finish the corner, take the corner of the light green module which, at the moment, is next to the white module, and put it in the corner of the white module.