Total surface area you want to cover, divide into sections with 2 inches in between, buy cheap frames at wal mart, order cropped prints on ezprints.com...Did this to my wall but added 3 demensional art pieces and metal work in between frames.. looks awesome!
Bender Photo Collage - 4' x 6' canvas with 12"x 14" blocks of 4x6"photos. Glue pictures on with Elmers glue leaving a small border between. I nailed the canvas to wall behind random pictures to keep it smooth. We bought "primed" molding to frame it and nailed to wall. It still needs a light coat of our trim paint color. Maybe next week! ; )