@Retrochewy What about:
birch wood bark blocks
birch wood bark bricks
chiseled birch wood bark

nope not vanilla ones in anycase

@ardoasms if your fine losing a bit of shape, you could swap to wool or bone

bone slabs, bone stairs, chiseled bone?

@Retrochewy bone slabs, bone stairs, chiseled bone?

also a cool idea but unfortunately not in vanilla however desperately people want cool new stairs and chiseled blocks.