on a more serious note in the past I have innoculated spent grain mixes with mushroom mycelium (after sterilization/pasteurization), works fine for growing a nice bed of edible mushrooms if you can get clean spore or mycelium. Although a single batch of AG grains is a significant amount of material to sterilize, which is best, though pasteurization is not that difficult, as its pretty much pasteurized right from the mash tun due to mashout temps
I don't even like mushrooms, in fact I hate the taste, but they're pretty and fun to grow. Maybe a mushroom eating AG'er would be more interested in it than I was. I can see it would be another craft/hobby to add to the repertoire of DIY foodstuffs (beer, wine, cheese, next.. mushrooms).
[if someone is seriously interested in giving this a go I can track down some shiitake spore/mycelium or other edibles. And no, I won't help you find spores for the psychoactive/poisonous mushrooms!)