I was looking through some of the grammar in the library, when I was suddenly reminded of Marugoto, something I used when I started out trying to learn japanese:
Perhaps just a small portion of the GUI design could be adopted into Renshuu's grammar library?
Although the colors aren't too similar, the idea of rounded borders would look pretty great on the library and help seperate out the terms too.
I'll consider it, but I'm probably not going to add colors there - colors are really a tricky thing to do (something I'm not particularly good at), and while the above images use colors for pre-defined categories, adding colors to a list of variable length can get tricky (what do you do when you run out of colors? Just repeat them? When colors mean a specific category or meaning everywhere else on the app, why do they not mean anything here, and are just used for separation?
The probably could be a bit more breakup between the elements with slightly larger titles, and it's something I hope that I can get to later this year :)