Make steps float by hiding their risers behind a thick carpet of foliage. Try Boston ivy; its clinging tendrils make it easy to train and keep trimmed to prevent tripping, and its green leaves turn a rich reddish-purple in the fall.
Red Creeping Thyme for small yards -- The to plants are densely covered with tiny, dark green, shiny leaves that are intensely aromatic when crushed; plant them between paving stones and enjoy their fragrance every time you pass by.
Tuffits: Concrete stepping stones which look like pillows! Concrete stepping stones that look like vintage pillows. Get old pillows, lather with petroleum jelly, cover with plaster of paris. once hardened, remove pillow and fill mold with concrete!