DO NOT MESS WITH THE ITEM SYSTEM OF DIABLO. I like this project, but you people are painting with some very wide colorful brushes just throwing out ideas you think are neat and cool. This game is good because of the way it was designed.
Ethreal items ARE good in Diablo. You just have to find the right way to use them. If you never used an ethreal item in D2, then you have no room to speak on it. Literally all seasoned D2 players have used Ethreal items. Ethreal is MEANT to be a negative thing until it is "accidentally" by chance matched with the indestructible property, repair durability property, or used on a mercenary. This is what made Ethreal so unique and such an interesting part of Diablo 2. Start changing things like this and you will ruin what was already GREAT about Diablo.
Do NOT add a way to craft class specific items. Crafting was merely a way to bridge the gap between what you had and what you needed. Not a way to make the best items in the game. Crafting does produce some really good things like rings, gloves, boots, amulets, but the reason why Pelts, Barb helms, and other items are SO VALUABLE is because you have to go find them in the world. Being able to Craft them just makes that process easier and less rewarding.
Using body parts to craft things? What? Why? So people farm each other over and over again? This idea just sounds very colorful and ridiculous. Great thinking outside the box, but it's just weird and necessary.
I am not trying to bash anyone or hate on peoples ideas here, I just want folks to step back and realize that you are not a game designer and Diablo II was the best hacker slasher ever created based on it's ITEM SYSTEM and play style long before you touched the game. Granted there are some shortcomings in it's design, the item system was NOT one of them. Please have a little respect and don't ruin this game's future with wild redesigning of how it worked before.
Shortcomings would include things like: Stash size was ridiculous. The inability to transfer items across characters. Teleport allowing players to run through dungeons at light speed and farm bosses or rush people through the game. The maggot lair map. Act 3's entire map being insane and confusing. Bots. The list could go on. But THESE are the type of things this ENHANCEMENT should aim to fix. Not reworking the design of the game's best attribute, it's item system.