[inclemnet]

I think it's still generally the case that Kivy apps tend to use the default (clunky) theme or something more custom, but there has recently been some user activity around alternatives, e.g. a set material design themed widgets (https://github.com/kivymd/KivyMD). I'm not sure if any apps using this have been published on the Play store.

We've been discussing how to include more unified themeing capabilities in Kivy itself, ideally as a big new feature in the upcoming 2.0 release.

Edit: I wrote a post at http://inclem.net/2016/01/15/kivy/kivy_android_app_showcase/ about some of the best published Kivy apps including themeing considerations, although they don't aim for a standard Android UI either. I see in your edit you've already seen this though.

[vanous]

For those seeking screenshots, i have found https://kivymd.github.io/

This definitively looks interesting. I had previously tested kivy and only had little issues with pyjnius and font sizes as switching between versions. More modern looks sounds great, might the resurrect that old project.

[mixedCase]

Hi, I'm the main developer of KivyMD, very cool to see it pop up here!.

I must warn that it's still in alpha status, although being used to develop business applications. Any bug reports and PRs are appreciated, and anyone has any questions, just shoot!