This isn’t exactly a feature request, but I thought I’d share this in case someone finds this inspiring enough to make a theme out of it.
It seems there is an interesting design trend that is surfacing these days, a bit like a hybrid of material and skeumorphism. Check it out: https://uxdesign.cc/neumorphism-in-user-interfaces-b47cef3bf3a6
A Modern / Material (upgraded) card usually is a surface floating on top of our perceived background and casting a shadow onto it. The shadow both gives it depth and also in many cases defines the shape itself—as it’s quite often borderless.
Neumorphic cards however pretend to extrude from the background. It’s a raised shape made from the exact same material as the background. When we look at it from the side we see that it doesn’t “float”.
The article has some examples of how to put this into practice with CSS, under the “coding” header. There’s even a generator at https://neumorphism.io