>>96101214
if you make it cohesive it can work, like having a unit with grass and rocks and another with just rocks or just grass
if you do one with desert and another with dark mud or grass it will look off
with characters you can have more leeway if they dont usually integrate in an unit, like a lone mage you can put him on some cobbles as if he's on a tower unlike the rest of the army who would be in the field

for big stuff like charriots, flying units an the like you can go wild, again, as long as its cohesive