Here's the current workflow I use for the foliage (Blender + Substance Designer):
I wanted something that looks simple & cute!
And here's a look at the Substance Designer Graph:

My first try this week looked like this:
I found it was a bit too undefined & looked more disgusting than cute. I solved this by scraping the edges of the highpoly & generally pushing the shapes a bit. Also I edited the roughness (a lot of "disgust" I think came from that) + added edge highlights to further highlight the shapes & create a clearer look.
The colors have stayed the same.
Next Steps
- complete atlas & build duckweed lowpoly assets (they will be seen up close, as the game world is a glass jar)
- continue learning Unity shader graph (so I can later make underwater shaders for the the project etc.)
Here's how the atlas currently looks (still need to add the roots + the leaf underside):
Thanks for looking! I have an Instagram now if you'd like to see WIP art and breakdowns: @tinymoss.