I did this in a bit of a hurry to check against the Birdwell swatch:
The only Lime that they had was flourescent - which was just too disruptive!
I also wasn't sure about the "Gold" and wondered about "Coral" as an option.
From this painting I was able to locate both "Gold" (it has some black) and "Coral" (orange with white but no additional red - which surprised me - a lovely color but not suitable as a transition to green). In the end I have gone with "Gold" and "Lemon" as my tertiary colors but the absence of "Lime" is unfortunate!
Anyway, this was a bit rushed in execution but I do like the form (stolen from the CMYK gallery!) and should revisit it properly for all three secondary pairings.
