Bow to it.
Touch it.
Kiss it.
Embrace it.
Anoint it.
Oil, ghee, honey, blood, semen, ocher
Pour a libation to it.
Water, milk, beer, wine, mead, liquor, blood, semen
Offer to it.
Bread, fruit, meal, tobacco, firstfruits, the hunter's portion
Crown it.
Flowers, leaves, grain
Garland it.
Flowers, leaves, grain
Pray to it.
Sing to it.
Circumambulate (walk around) it.
Dance around it.
Please note that not all modes of reverencing are appropriate to all standing stones.