Umm, toys are sort of like painted rocks too, if you think about it, aren't they? If you make like 20 painted rocks and they're good, what might be a pandemic hobby or one lady's trash, it might be a treasure to some kid or person somewhere far away. It's special. Some of the things you hold precious and close to your heart, may not be as expensive or valuable to others as they are to you. The value of those rocks, I guess, if you found rocks, which happen to be white, so, you must've painted them white, then, you drew a mummy and a skull, you coloured it, so if you have a collection of 10 or 20, it's hand crafted, so, some kids might play with it. Maybe, you can put up an Instagram! You should put up an Instagram! You can start your own cult, get a cult following, call it the stone painting, maybe donate some money to charity, get a website, hire a team, charge membership fees, wear uniforms, get a theme song, I don't know. You can make an app to rate other people's painted rocks. There's no such thing as a painted rocks thing, but you can start it. Good luck!