The greatest decision I made when starting my gallery wall was purchasing these simple, white, large-matted frames at Target in both 8 x 10 ($17) and 5 x 7 ($12) sizes. I bought about seven or eight to get started, and boom, I had a gallery wall for around $100. Seven years later, Target is still selling the same frames, which means adding a photo or two to my wall has been easy and inexpensive. In addition, the white frames and mats, hung on a white wall, are superforgiving when it comes to exact measurements between frames (in other words, I eyeballed everything).
I just started a second wall (as I said, I've been at this for a bit now), and switched from white to these Project 62 brass frames ($15-$30), also from Target and available in three sizes. The common theme to both sets of frames: large mats that add some gravitas and uniformity to the photos.
