At this moment, there is little known about Yantras in the Western world. Many people consider them just pretty pictures and some artists claim to draw "Yantras" from their imagination. They are very far from the true meaning and use of Yantras. First of all, Yantras cannot simply be invented from imagination. Every specific mood and emotion has an associated form energy and shape. This unequivocally determines the form of the Yantra associated to that mood. The traditional Yantras were discovered through revelation, by clairvoyance, not invented. One needs to be a true spiritual master, a tantric guru, to be able to reveal a new Yantra to the world.
Search the Internet and the libraries and you will find very little consistent knowledge about Yantras. Some people placed Yantras upside down, a monument of their ignorance. You cannot place a Yantra just any way you please. Anyone knows that when the cross is held upside down, it is no longer a benefic symbol. A Yantra put upside down is no longer the same Yantra
There are different types of Yantras for different purposes. They can help you to attain success in your business, bring the person under your control, and bring wealth and prosperity to you. The Yantras have to be purified and energized before using it. Yantras energized during the nights of Maha Shivratri, Holi and Diwali are most effective and powerful. Normally the related Mantras are also chanted in the presence of the Yantras for quick results.
It is auspicious to see the Yantra daily in the morning and one should lit incense/dhoop or lamp with ghee before the Yantra every morning. By doing this the native is blessed with success and wealth. We send these Yantras only after Pran pratishta (energising or performing Pooja on them).
All ancient cultures had sacred geometric designs representative of their Gods, which had a mantra (or sacred sound vibration) that corresponded to it. In the Vedic culture, we find much power and energy said to be held within sacred geometric symbols. Yantras are not "lucky charms" to be worn or displayed as icons of power in and of themselves. Much specific knowledge and ability must go into their preparation and much dedication and worship is required to achieve the desired effects