When you print the template score the lines as shown.It may appear there is a square piece missing from this template but don't worry this template is designed to make the spring card big we add the square later.
Once lines are scored bend fold the lines so you are left with a point and the base is facing you.
This is how it should look like.
Know bend the triangle back and let go it should spring back up.
This is where we add a square card stock.
This square should be light so try to use light card stock.
I have provided the square template on the bottom.
You might don't be able to see the template because I drew it lightly so you can use this straight on card stock when printing.
Depending on your printer size not be the same.
To make your own template of square, draw around the triangle and flip it over and trace the triangle again if you a perfect square.
Decorate the square before adding this on the spring card.
Use adhesive on the lower part of the triangle.
Now you have a big spring card.
For the template click
here.