Being an ABC member, I recently received this Samantabhadra Bodhisattva (普贤菩萨) card, which is a protection card compiled, designed and blessed by Lama Zopa Rinpoche.
"This Samantabhadra protection is from the great lama Thrungy Chokyi Nyima. It eliminates any bad things and creates both outer and inner success. The main deity is the Bodhisattva Samantabhadra. Above are the three types of deities: Chenrezig, Vajrapani, and Manjushri. On one side is Hayagriva and the other side is Lion-Faced Dakini. Below are two kinds of Garuda (Multicolored and Black Garuda).
It is said by Vajradharma, who is the All Knowing One, that this instruction can stop any kind of harm. By displaying this protection in the house, those activities which have no meaning will become meaningful, and virtue will be created in the house. In this way, having this protection in the home becomes good feng shui, a way of creating an auspicious environment."
We must first consecrate this protection card and then it can be put above the front door. It can also be placed in different parts of the house; above windows, to the side of front door (outside) etc. It is important that the image is protected and can not be destroyed by the rain.
In addition, of course, the best protection then on is to purify negative karma that one has already created and not to create more negative karma which creates bad feng shui and so forth.