4TH of July Card - window card using rub-ons

I am in the middle of posting instructions for this awesome 4TH of July card using rub-ons as the window!

Here is the link to the How to Guide for this festive, patriotic card:
http://scrapbooking-paper-crafts.helium.com/how-to/14701-how-to-make-a-fourth-of-july-window-greeting-card-using-rub-ons

I am not sure if this technique has already been used or not, however this is one of my creative ideas put into action.