Heres some base 16 colors I've been tinkering with, still probably needs more tweaking but you get the idea.
dark amber:
#160C00,#1C0F00,#382000,#4C2D00,#B55D00,#D16F00,#ED9E00,#FFB000,#DC3200,#CB4B00,#723900,#738500,#1F7500,#1D6B00,#6C7100,#9E2800
light amber:
#FFB000,#ED9E00,#D16F00,#B55D00,#4C2D00,#382000,#1C0F00,#160D00,#DC3200,#CB4B00,#723900,#738500,#1F7500,#1D6B00,#6C7100,#9E2800