DIY: Gallery Wall Arrangement Ideas - plus many other guides, such as yardage guides for upholstered furniture, window treatment & terminology guides, area rug size guides, etc. This is an excellent resource!!!
Bender Photo Collage - I used a 4' x 6' canvas with 12"x 14" blocks of 4x6"photos. Think quilt blocks. Glue pictures on with Elmers glue leaving a small border between. I nailed (every 12 inches or so)the canvas to wall behind random pictures to keep it smooth. We bought "primed" molding to frame it and nailed to wall. Paint trim to match woodwork. This has been up 18 months and still smooth.