Also on these boards
Total surface area you want to cover, divide into sections with 2 inches in between, buy cheap frames at wal mart, order cropped prints on ezprints.com...Did this to my wall but added 3 demensional art pieces and metal work in between frames.. looks awesome!
I really like calm light blues and teals so far, because you can easily brighten it up or calm it down. Also, a variety of black and white photos arranged in a not too busy way may be nice.
Though this type of stairstep arrangement is more difficult measure and hang, it has a huge impact on a stairwell area.