Yesterday, Ramesh shared a picture of the trimmings they use on their passementerie straps. I thought they were made in-house but apparently they are from Declercq Passementiers, who specialize in these sort of things. Kind of like how Hermès collaborated with Maison Lemarié to supply them with feathers for the Feather Kellys.
www.declercqpassementiers.fr
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And they come in other colors, too. (that magenta/anemone Diane looks interesting)
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So I guess if you don't like the current passementerie strap offerings of JD, you can go to Declercq Passementiers website, look at their catalog, see what you like and ask JD if they can use that instead.