Logic - Possibly a stupid idea :)

Ok i just read a post asking if it was possible to convert an image into ASCII (text form) and this would basically mean the image was made up out of different characters depending on the tone/shade of an area, this just gave me an idea which is either very clever and would be amazing and open up countless intelligent texture possibillitys or is a stupid idea, anyway heres the idea, basically there would be logic modules which define the output path, if color at set area matches set color then path goes to output A, if not to output B, and other similar modules, this way you could have intelligent effects and stuff.