Package - ggthemr
Novelty - Yes
Type - qualitative

ggthemr - flat

Github

Mikata-Project/ggthemr

CRAN

Not on CRAN

Use with paletteer package:

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

Use raw:

c("#34495EFF", "#3498DBFF", "#2ECC71FF", "#F1C40FFF", "#E74C3CFF", "#9B59B6FF", "#1ABC9CFF", "#F39C12FF", "#D35400FF")