If you like to hang pictures on your wall, this might be your style. I am not sure exactly when enough is enough pictures, but as long as the have the same colors and themes it can't be too bad! :D
Collage wall to display pictures and other memorabilia. You can change out the pictures over time. Buy the same colored frames in a variety of styles and fill frames with anything meaningful, not just pictures. Basement entryway wall idea from Young House Love.