Not sure what you mean. Need more information please
Bushes orShrubs on the Sides: Azalea or Something else more Green. Or possibly a Small Pine or Miniature Fir Tree. If you have enough garden you also may want to also select a few fruit trees at: Fastgrowingtrees.com
not quite sure what you mean do you want to still be able to use it as stairs just dress it up? or just disquise(cover)it up?
Hi David, You could paint and stencil it. Use porch paint so it is durable. Then put down some rubber stair step mats in a color that matches so that it is not slippery.