I have Ethiopundit to thank for alerting me to these color pictures of the Western Front from the French culture ministry archives. It's most unfortunate that the site is so badly organized that I can't find the index to the whole series, as I have a feeling that what's available on the page I've linked to is only a small portion of what's out there.
Click for a larger picture.
I wonder where exactly the picture above was taken, and where the troops in it came from. These are the sorts of questions it would be useful to be able to consult the French government's website to answer, and hopefully someone will have better luck finding the relevant location within the site than I've managed thus far.