Print out your picture on card stock. Measure carefully, and cut the picture in half. Now measure and cut each section in half again, so that you have a total of four pictures.
With your finger rub the foiling glue on top of the picture square edges. Do the same on each and let dry. This will take about an hour.
When dry, you can begin the fun part, which is to embed the foil. Place the foil, with the shiny side up, onto the glue and repeat until all the glue is covered. Do this for all four pieces.
Cut the cardboard to the size of the frame and place your foiled picture squares so they are lined up but separated a little. Put in your frame and stand back and admire. Repeat with another picture if you want a matching set of two "window framed" pieces of art.