I absolutely adore these picture walls shown below from Pottery Barn.
(Want to add some depth to your display? Check out the frame risers.)
However, creating one can be a little intimidating. Enter, The Picture Wall Company. This product helps you create the perfect picture wall in minutes! The set includes 10 picture frames (offered in various finishes), images, hardware, and a "pre-view" template which adheres to any surface. All you need is a hammer! I love instant gratification so this idea works for me. Over time I would work towards replacing the stock images with my own pictures.
Check out this product and let me know what you think.