I was looking for easy ways to mount my photographs in cards, calendars and matted frames. I found a commercial solution at Photographer’s Edge online at: http://www.photographersedge.com. They sell sized format allowing you to use your photos in their presized products. The prices seem reasonable. Below is one of their cards with one of my 6″x4″ photos. Their card is 7″x5″ with an opening for your 6″x4″ picture.