Anyway, Faerie Glamour ended up being way darker than I remembered, but I totally love how it looked. Most of my photos captured the blue shift really well, but not much of the purple. It actually looks mainly purple in the pot, too. As for Petrol Black, the photos of the eyeshadow pot itself look kind of weird. It's a matte black colour that has loads of blue glitter in it, so when you put it on, it really is reminiscent of petrol.
Left: no flash. Right: with flash.
So, here's the look. I put Faerie Glamour all over my eyelid, with some Petrol Black on the outer V and crease. I also lined underneath my eyes with Petrol Black. The first lot of photos shows the blue sparkle. The second lot of photos show the purple shift a little more, with a lot of sparkle. The look was more glittery in person, though.