Answer:
What relies on columns but isn't a house, and asks for help but can't speak itself?
I am the tool, for inspiring many. Buy me in the store, for not much more than a penny. Don't overuse me, or my usefulness will go.
Bury deep, Pile on stones, My mind will always Dig up them bones
Whiling away the hours of flowers, Walking through fields of gold. Preening and pruning in lights fading hours, For petals to freeze in the cold. What is it?
Left to right I’m quite bright. Right to left I might bite.
You use it between your head and your toes, the more it works the thinner it grows.