Intended to be used with Supplementaries' Rope, its Buntings would be a nice addition to Fairy Lights' own Buntings. Adding Supplementaries' Buntings to Fairy Lights' "Pennants" tag allows them to be used for crafting, however the color of the buntings aren't respected. It appears Supplementaries uses its own NBT data to differentiate the colors of the buntings. I don't think there's a need to change textures, as conveniently it defaults to the triangle pennant when using the Supplementaries' Buntings. Just the colors need to be translated for complete parity.

Supplementaries Pink Bunting on top, Supplementaries White Bunting on bottom crafted with Fairy Lights' Pennant Buntings.

Added to the Pennant tag.

All available Supplementaries and Fairy Lights Buntings.