I made a quart of aioli yesterday: olive oil and garlic mayonnaise, amazing.
It is a little yellower , may be the yolks or may be the olive oil.
Don't need mustard powder, I use a dijon mustard that I keep in the fridge and it works quite well...just taste and keep going. Add more acid (vinegar, or lemon/lime juice) if you like. All up to your taste. I use himalayan salt and fresh ground black pepper.
Also a few day ago I pickled 28 eggs and placed them in a big glass jar in the fridge to pickle further. Takes a couple weeks I think.
Good thread, keep it going!