I like this... would even try in a hallway that did not have stairs :-). Frames on stair wall: four quiet colours - white, gray, blue and green, with photos in all of them. frame wall by Sandra on her blog sawdustandpaperscraps Decor Ideas, Stairs, Colors, Gallery Walls, Photos Collage, Photos Wall, Picture Frames, Frames Wall, Pictures Frames
Also on these boards
Photo Gallery - Stairs Like the lines: frame bottoms level on top row, frame tops and bottoms level (though not exactly here) in middle row, and frame tops level on bottom row. Simple idea, but very nice. Great colors, too, with stairs also painted different color from walls.
frame collage. This is actually very, very similar to the one Joey & I created: round mirror surrounded by square frames. I was thinking of "beefing" it up a bit and adding more frames, though, and this is a great template.