So, you know those AI Art Generators? The Insurgency, in all its infinite[hah] knowledge and unethical experiments could have potentially injected some anomalous code they found into one of those apps. The anomaly isn't the AI art itself, but the code, which is specially suited to anomalizing pictures. The Code was found in a failed raid upon the Wanderer's Library, where it was one of the few things the Insurgency could plunder before being driven off by the countless horrors just hoping to enjoy the library.
My idea for the effect of the code it either causes a memetic effect relating to the picture generated, or the picture morphs the viewers into something relating to the picture.