More materials (maybe even other mods') for the display plates would be nice. I thought about how to programatically achieve that:

• Have a string config of delimited material names, e.g. "iron-plate; uranium-238" etc. , pre-filled based on loaded mods.
• For each material, get a dominant color from the item sprite, generate the three corresponding plates, apply a sprite layer of dominant colored tint on the display border

Some caveats:

• There is no graphical access to sprites for mods, so no possibility to access a dominant material color → needs to be configured per material
• Currently there isn't just one colored base sprite. One could take the three existing sprites and remove color to end up with three base sprites (rusty, normal, shiny) → needs to be configured per material

So you would end up with a setting along the lines of:
"{{"iron-plate", {r,g,b}, "rusty"}, {"copper-plate", {r,g,b}, "normal"}, {"steel-plate", {r,g,b}, "shiny"}}"
...which is not very player friendly :( but might be okay if pre-filled.

(See github issue for reference.)