There are a few threads on it. Considering my results, probably best to look at those.
I mixed luke warm water and extra light DME in a wide jar. The extra light to not get too much flavor from the DME. I added a few hop pellets too after reading they could discourage undesirables from taking hold. Then I folded and tied some cheese cloth over the mouth with string. It's got to be very tight to keep ants and such out. This went on a stool under a tree. After about a week, I had white skin looking mold with fuzz on it. There was a green hue to it as well.
My next attempt was the same but for two weeks. That's when I got the blue mold. There were these salt crystal looking things too. Nothing that looked like the pictures online.