There is only one way to do it right
Simply scaling an image up to the summed size of the available steps of a staircase and then cutting it into even pieces that match the front sides of the steps will destroy the original artwork. Due to the surface of the staircase, such procedure will result in a jagged and totally out of shape image.
Only Shapeshifter Media's patented method will allow for a precise calculation of any image to perfectly match the surface of any given staircase. Your artwork will become a giant large format on an exclusive advertising space.