Transparency Paper (1/4 to 1/2 sheet per pair of glasses)
Cardstock (1 sheet for every pair of glasses)
1 red sharpie
1 blue sharpie
Print out the template for the glasses on card stock. Here is the template.
Place piece of transparency paper over the section on the template that requires you to color in the right and left lens in red and blue sharpie. Color in those boxes with appropriate color.
Cut out glasses pieces from the template.
Glue transparency paper to the open lens spots in the glasses.
Glue glasses together according to instructions on template.