Proposed flag (by me) for the Occitan Valleys, based upon:
1.The Occitan Cross (or Cross of Toulouse), in its with-void variant present in the Occitan national flag (thus an "Occitan Cross" without the "Italianity" of a voidless cross based upon the Terra Brigasca, in Pisa, and other Italian blazons).
2. The colors of the Terra Brigasca, of Liguria/Genoa, and the medieval colors of Turin (all of which are in a white field, a red cross with keys/a bull, etc.). It's worth noting that Old Occitan's linguistic area at one point reached close to the modern cirty of Turin.
3. The colors of Piedmont (principally the colors of Savoy: A white cross in a red field), which, when inverted, match the previous set of colors..

4. The Star of the Felibres.
Own adaptation from File:Flag of Occitania (with star).svg
Briantin de Montrei