Better Immovable Blocks (Sturdy Stone, Quartz, Blackstone)

Currently, immovable blocks, or blocks that do not stick to pistons, are not the prettiest. We have shulker boxes, glazed terracotta, obsidian, melons/pumpkins, note blocks, furnaces and pumpkins/melons, but none of these are good for building and none of them fit any block pallets. This makes making things like slime doors and elevators in your base uglier than it needs to be. There should definitely be only a small selection of specific immovable blocks, but there should be a couple of nice looking ones. I'm thinking a gray block, white block and black block to match most color pallets. We could for example get Sturdy Stone, a stone block that looks like the furnace's top texture on all sides and is immovable, and same variants for blackstone and quartz. This would be a great addition and make

utilizing the new honey blocks fit in much nicer with our builds!