Law of attraction practiced prior to the 1800s. If you are referring to arcane practices in Babylon and Biblical times that we have little knowledge of, I am aware and have looked at these. If there are some specific and relevant references I would be interested in hearing them. As you believe in a LOA, most of what you hear will be filtered through this lens. As I now do not, most of what I hear will be seen through that lens.
How Do Angels Manifest Themselves
The ability to imagine something better is the fuel of all great invention, change or innovation in life. Without it, we are essentially floating adrift without a compass. Google is the grand champion of visualizing dreams, and making them happen. They give their managers 20 percent time off -- just to work on personal dream projects. Chade-Meng Tan transformed his engineering job to become their official "Head of Personal Growth" and teaches a Mindfulness based Emotional Intelligence course for employees. Meng hopes to see every workplace in the world become "a drinking fountain for happiness and enlightenment."
You claim that "positive thoughts always resulting in positive things" is not the basis of the LOA. In part you are correct. The foundational basis in science, as I alluded to in the article was that thought stuff particles travel through ether (not air) and interact with formless stuff to create whatever it is that you are thinking about. This was how "the law" started.