Back when I first discovered Goulet Pens and their ink samples, I ordered about a billion* ink samples. Because, hey, I could! And look at all the pretty colors! And then life got in the way and I used pencils a lot for awhile there and I pretty much forgot about the ink samples until I moved, and then realized I still had about a billion* minus four.
So this has been a month of playing with inks again, primarily in my Pilot Metropolitan and the Lamy Safaris, since they're cheerful and easy to clean out. I've only actually emptied a few vials, but it's a start.
But not until I've used up at least half a billion more vials, I think.
Edited to add: here's a post with a bit of info about how I get ink into my pens!