Amazing images, love them all, I like the one with the camera on the tripod
I had a little go with the steel wool too, in the empty building next door's underground car park, I was burned in so many places, so my intended orb got bend outta shape
You pack a steel whisk with steel wool, attach it to a length of string, touch the steel wool with the terminals of a 9V battery to make it go on fire, then spin the whisk. The steel wool throws molten beads all over the place and the photos can be quite dramatic!
Camera should be set for 100ISO, 30seconds, AWB and an aperture of around f8 to keep it all in focus. Hope this helps