The Witch can learn how to manipulate their own energy or free Universal Energy to create the desired effect. Users of Witchcraft tap into these energies. By lighting a green candle, surrounding it with Malachite, and sprinkling some Cloves on their altars, they share money attraction energies with these objects. Over many years a witch may be able to freely open energy channels without the aid of Earth-Based objects. Simply put - Spells.
Witches perform spells, such as the one described above.
Scents, colors, textures, etc. are specific to certain Gods, Goddesses, and Spirit Guides. This will also help to create the desired effect in the Witch. No, not really. Witchcraft is a very positive, happy belief structure. It is written directly in our code to harm no one.