Say you were on slopes and the snow texture was on the floor right.. Could you do something to change that texture into like.... a different texture? Maybe Grass?
loel, that can be done. you can also insert lights, and emmitters into a map. more neat things you can do is change the lighting, sky, water, and water texture.
use the search button by the fourm's title and search for: Map making tutorial .
EDIT: Or just look at the topic below this one instead :P