depends, actually, even if you have changed textures, appearances of model /entities, or changed a parameter of anything then its a mod.
my Zombie mod well part 1
DDDI: Quantity two (soon to have the a few maps finished and uploaded)as a quite a few textures that i have created and put onto my maps, on top of that i'am in the process of re-making player and monster skins on the barneys and zombies so this will be a mod
MOD = anything that as been changed from its original parameters.