I remember there used to be a Mod that had Skulls for the different races-- Orc, Argonian and Khajiit-- and Skeleton Tails; a search of Tes Nexus hasn't found it under "Skeleton Tail" or "Racial Skulls" (which I thought the names were). The one I am thinking of had them all as one set, with everything in it, but doesn't seem to be about... Does anyone know the name of the Mod I am thinking of, or one that has similar content?

Man, I tried, but http://www.tesnexus.com/downloads/file.php?id=32632 was all I could find that even resembles what you're looking for. There is the following line in the description, so maybe it is close?



Hope it helps...
veg

Following that link suggests that the skulls and tails came from http://www.tesnexus.com/downloads/file.php?id=26634

The only mod I can think of that does something like this is craftybits necromancy, which probably is not what you are thinking of, but anyhow:

the mod allows you to skin npc of their race specific skin, flesh, liver, eyes, various intestines and also their race skull (orc skull, argonian skull, kahjit skull) and then using the skull along with other bone parts (two spines if you want a tail) to raise a race specfic skeleton...among a load of other things.
it' in open beta though

Thanks for the suggestions, everyone-- some interesting Mods there, which may be useful

None of them are the one I'm thinking of, I'm afraid The one I'm thinking of, that I had for a little while (before my PC issues), included pre-modified skulls for each non-human race, already set up as helmets, and a spliced tail (similar to what Veg linked to)-- and nothing else :S

Either way, these Mods look like they might be helpful if I can get in touch with the authors, and hopefully work something out so thank-you for your help