Picture frames are age old method for decorating walls. However, they can never get stale. You can use framed pictures of anything under the sun- your family photographs, paintings, modern art or anything that gives you a good feeling. Just try to get frames with the same finishes or color.
Wall decoration with picture arrangement will result in a unified picture arrangement while decorating wall. Another way for an organized and uncluttered picture arrangement on wall is to use the same size mat for all pictures and artwork. Hang the pictures at eye level- about 5 feet high from the floor.