The secret, it would seem, is to buy Filter Forge and then sell the textures you create. You don't even need to change the default settings much, apparently. Does the Filter Forge license permit that? It's very generous if it does.
Oh what a smart guy you are? You have blown my cover and ruined my plan to get rich by selling filter forge generated textures!..
I didn't say I'm drawing them or shooting photos and making textures out of them. So please don't act as I'm trying to fool people. I'm not selling anything yet, just asking. Thanks.