Thank you for your kind words. I wouldn't call it high-quality, though. I wrote this back when I barely knew how to wield Lisp or use Emacs. I've gained much more experience in both since then; I keep promising myself that one of these days, I'll clean it up and make it a stellar little mode...

As for getting it into mainline, I'd be OK with going through the FSF copyright paperwork, but I worry this will probably fail over the uncertain status of Nyan Cat image/music IP...