ok, so here's my idea. In the background of the screen you shoudl see the next biome in that direction, it not actually be there and would only be an image on the horizon. for example, in the lone lands looking east you might see the misty mountains in the distance(depending) on where you stand. or if youre in gondor and you look east you would see the Mountains of mordor with fiery clouds of shadow. for biomes like the shire, where you wouldnt be able to see past the borders you would see something like rolloing hills and a few patches o trees. And again, there would not actually be chunks loaded, it would simply be an image on the horizon.