I worked on prismarine blocks today. I wanted to have more details on the albedo/colormap, remove some baked-in AO and improve the external texture AO map. I also added some more fine detail in the material.
Grass and tall grass have had some adjustments too, I made grass blades a tad larger and scarcer. I tried finding a good balance between Vanilla and detail. These adjustments can (and probably will) go back-and-forth until I find the right balance.
All screenshots use the Kappa v4.1 E1 shaders.
HardTop Vanillaccurate 