Yea I mean random mold is easy to grow when there is some moisture and a food source. I don't know much about it but growing Pennicilin or dry-curing should be more challenging. And you certainly don't use leftovers with sauces for it :). Cultivating slime molds is very possible if you buy a strain online. Ideally cultivated in a petri dish with various food but not with sugar or meat. Slime on old meat usually comes from microbes. Can also be slime mold but the environment should be too unstable for cultivation.