So here's might be all for nothing, but I just throw it out there and leave it all up to a community vote, or a staight yes/no answer from Xavier or the administrators and moderaters.
French colonies
Royal Standard of France, before 1792French Guiana
Former Departmental Council of French Guiana. (Yes, it was disbanded in 2015)
Current local Government Flag of French GuianaGuadeloupe
Colonial flag of Guadeloupe
Colonial flag of Guadeloupe (Red version)
Flag used by the Independence and The Cultural Movements
Flag of the Guadeloupe RegionMartinique
The "Snake flag"
Territorial Collectivity of Martinique flag
Territorial Collectivity of Martinique flag (used in sporting events)
Nationalist and Independentist flag(
Nationalist and Independentist flag in Martinique)Réunion
Proposed flag by the Association for the Réunion (ARF)
Proposed by the Vexillological Association of Réunion (VAR)
Proposed flag of Réunion by the Nationalist movement
Unofficial cultural flag of Réunion (MLK)
Region Réunion
Region RéunionI vote for number 1 in all cases, but I just realised that number 3 is currently used for Martinique in the Country list.