"Natural" I guess you would say. I use a basic ABC culture starter whereas I think greek yogurt uses additional or different bacterias. My yogurt is also usually very thin. I use straight up milk with no thickeners whatsoever... except cream on some occasions but that's more of a flavour thing. I also never, ever use homogenized milk, which I think also affects thickness, but don't care to be honest. That shit wreaks havoc on my guts and I want nothing to do with it. Paseurized I can tolerate in small amounts, and especially moreso when turned into yogurt. Real yogurt is a special thing.
The process of making yogurt is actually quite simple too. Pretty much take your milk, bring to boil point (helps thicken), cool to around 40C--maybe a tad under, transfer to your "pot" (jar or whatever), add your culture (either a commercial starter or already active yogurt... whatever tickles you), incubate around the same temp for 12-24 hours (keeping a close eye on it after the 12hr mark--don't wanna over culture it!), put in fridge for 24hrs and voila!
Oh yeah, and also been experimenting with infusions lately. Vanilla bean, spices (cinnamon, etc), that kind of stuff.... mmmmmm.
Have you ever had kefir?