I vaguely remember "crackle" mentioned at one time, maybe twice, but I don't think they were mentioned on a positive note, but I could be wrong. I think yours are the first intentionally done this way and they look absolutely great. I love the creativity and thanks for posting the picts and challenging others to give it a try.
Curses! now I have to try this, I really like the look. I've seen where they take tumblers and spray paint them different colors then spritz some Dawn foaming dish soap on it and spray black paint over everything and immediately hose it off for a really neat look.....time to experiment. Awesome job on your pens!