I've just finished my actual bunch of French garde d'honneur, right before FIGZ. That doesn't mean I'm done with that subject - there are still some cities left and haven't even startet with deep research.
Garde d'honneur de Aix-en-Provence. This city is the historic capital of the Provence region in southeastern France and is today the eleventh largest city of the country. The city history goes back to the Roman city of Colonia Aquae Sextiae Salluviorum - the later name Aix is a shortened reference to the former latin name.
The city of Amiens is another one that already existed in ancient times. It is located in the northeastern part of France, relatively near to Belgium. Most of you will probably connect it to the Somme area where heavy trench battles took place during WW1. Note the black crossbelts - pretty unusual, especially for French units
Bayonne - a city located near the Pyrenees, a mountain region that divides France from Spain. Bayonne is located on the atlantic coast and has played an important role during the revolutionary and Napoleonic time. Being close to the Spanish border, a lot of diplomatic activity has been done there. In 1814, Bayonne was besieged by the British - read more under Battle of Bayonne (Wikipedia) - which means that this unit is definitely of interest for wargaming.
Lille is in fact directly on the French-Belgian border. It had some 50,000 inhabitants in the early 19th century and was a center of textile production.
This is a member of the Garde d'honneur de Nancy, a city located in the eastern part of France.
Orleans is a city with a rich history, located approximately a hundred kilometers south-south-west of Paris. It's likely that units like this were crammed together for defending Paris in the last part of the 1814 campaign.
Rennes, located in the northeastern part of France, is the only example of two different uniforms within the same city guard that I have found so far. Dark green-pink is for the 1st, dark green-dark yellow for the 2nd company.