I can't stop looking at these two "fire"-themed (yet very different) photographs! The top image is titled "Autumn Fires", by Toni Frissell. The bottom is a long-exposure shot of lightning bugs by Kristian Cvecek.
I found a set of amazing photos of lightning bugs at dusk, taken in Japan. There's even a "Firefly Park" in the town (Hokubo). This one is my favorite photo of the bunch.