Early concept: Let's say there is a nice artsy picture, and it's visuals need to be replicated in the scene. Normally It will take some artistic fiddling, but in theory, brush shader could use that fancy picture to paint the diffuse color needed to perfectly recreate the desired colors under current lighting.
So, artist sets light parameters and objects in the scene, using the picture. Special shader could project that picture onto the objects from predetermined projection source (Most likely: Main Camera). The same projection source will be used later to compute the color that needs to be painted onto texture for it to have needed color when lit.
There will need to be a special deconstructor brush for different shaders though.