1: for tilesets (the stuff that makes caves) they should all be greyscale. for each interior there could be a value that the engine uses to colour the tiles, this way there apears to be more tilesets without significantly increasing memory/time (but there still needs to be more tilesets than oblivion without this colouring idea)
2: like the tilesets, the common cloths should all be greyscale, the items in the construction kit should have values on how the item is coloured. again this would save memory and allow for more stuff to be made. infact anything that could use this greyscale thing should
3: fur on animals again needs to do this, but there should be some sort of ofset to randomise some colours in the fur that puts patterns in its fur.
4: HUMANS NEED SOME SORT OF OVERLAY SYSTEM (a texture that goes over their regular texture) this can achieve...
- facial features such as freckles, creases,warts etc
- environmental things such as soot,snow,mud,water and blood and so on that can splash/find its way on a face/body/hair
- TATTOOS, tattoos fitted with the lore,they looked cool, they added variety and personality to people, and they can show belonging in a group.
- body hair on humans, different fur paterns on khajits (tiger like, leopard like etc) and perhaps even muscle definition could be achieved
- visible damage- a large gash, a 3rd degree burn, an arrowhole etc
-visible diseases, someone could have large grey spots on their face to tell you to stay away from them.
5- material types should act differently, such as how do they change when they are wet, how snow should appear on it,how flamable are they, how dirty can it get etc. it would break immersion if the character walked out of a snowstorm without a bit of snow on them, or if they where under water and still had snow on them.
6- if races, even minor ones such as dremora, have low res textures then i will be sad
7 terrain textures should have wet/snow/dry versions, this should completely change the landscape (mountains could go from green to white if it hasnt snowed there recently)