I've been working on these themes for about two hours now and I think they're pretty much done.
As requested by Batman8, I made a 12h version of my Tron theme (with an AM/PM indicator).
Both the 12h and the 24h versions have two theme.json in their folders, this is because one is default blue and the other yellow. It's obvious which one is which when you take a look.
[this is the picture I used for the yellow color]
I also made other versions of my Japanese theme: one with Arabic numbers (1, 2, ...) and one with Roman numbers (I, II. ...)
I'm not 100% sure how these look as time moves on (if the hour and minute hand obscure parts of the numbers, or if they don't circle some numbers as intended. I haven't had the time to check, as I just made them. But the Roman numbers can get quite large (VIII) and the hands may obscure those numbers a little bit, but it shouldn't be all that bad).
I hope you like them!
PS. They're still WIP. (Especially the Tron ones, I'm quite happy with my Japanese theme.)