Scene-Setting Staircase: For a more detailed look using decals, try a mural decal on your staircase. Mask the treads with painter's tape and paint the risers in your desired color. Remove the tape before the paint dries completely. Measure the risers and cut decals to the size needed to fit on each riser. Adhere the decals according to the manufacturer's instructions. (Wait until the paint is completely dry to adhere the details.) If desired, apply clear sealer to protect the decals.
Great tutorial on how to replace carpet on staircases and then install new stair treads... at a cheap cost rather than buying them premade from some website thats waaayyy more expensive... exactly the info I was looking for!