These are amazing. Everything about them is amazing.
They were made by Reddit user Crippledplaything for her boyfriend. Apparently he wanted something Bloodborne related for Christmas. There wasn't anything out there worth buying so she decided to just make something instead.
She made these incredible Bloodborne Blood Vials.
There's a lot of great detail here. I think my favourite part is the way that the item description is on the bottles themselves. Also: that fact that she's made Iosefka's vial (the one-off special vial that gives you extra health). That's amazing. It has a keychain.
I would consider buying these. Seriously. At a high price.