Unlike with other animals it is not possible to change snake skin with
setObjectTexture or setObjectTextureGlobal commands despite there being a variety of different textures available in files.
Not sure but it could be because a snake has the following misconfiguration?
hiddenselections[] = {"camo"};
hiddenselectionstextures[] = {};
There is even randomise script which should work but it doesnt
_this setObjectTexture [0, ["\A3\Animals_F\Snakes\data\Snake_Dice_CO.paa",
"\A3\Animals_F\Snakes\data\Snake_Leopard_CO.paa"] select _randomSeed1];