I know it's possible to texture formspec menus, by defining a background image for each. I was however wondering if there's also a way to define a default appearance for all formspecs, including background texture and perhaps text color. If not, could this ability be added in some form?
I seek this because I wish to texture the menus for minetest_game. However, I'm not going to re-define every individual formspec... such as inventory, chests, furnace, pause menu, etc. Even if I did that, mods which add their own formspec windows (like workbenches, technic_game engines, or things that rely on the Inventory+ buttons) would also have to be edited to use the same appearance. You also can't texture the main menu this way, or at least not easily... whereas a default per-game formspec theme would help a lot.
Obviously, when a formspec defines its own appearance, that should be used instead. I'm only looking to specify game defaults so the black transparent background and gray inventory boxes are replaced with something else.