Package - ggthemr
Novelty - Yes
Type - qualitative

ggthemr - greyscale

Github

Mikata-Project/ggthemr

CRAN

Not on CRAN

Use with paletteer package:

library(paletteer)
paletteer_d("ggthemr::greyscale")

Use raw:

c("#000000FF", "#515151FF", "#909090FF", "#D0D0D0FF", "#444444FF", "#111111FF", "#EAEAEAFF", "#666666FF", "#000000FF")