The instances your talking about are called smart objects in photoshop
You can create an image at the max res you want to work in then, convert the layer to smart object, scale down, adjust, and duplicate the smart object layer into a 3x3 grid space so you get tiling surrounding the middle square. then you can open the smart object layer in another photoshop window and thats the window where you could do all the work painting and use offset filter, etc like you normally would, then just ctrl/cmnd+s and it updates all the instances in the main doc. you can even make an image at the max res and duplicate the smart object layers down to the resolutions you want to work in, so you can dynamically preview them at multiple resolutions, all in the same doc, and all at the same time. Doing it this way saves me truckloads of time. The only downside is that smart objects like to eat up quite al ot of ram so...yeah, give it a shot.
Last edited by samman; 08-20-2012 at 04:30 PM..