The guys there have a great demonstration of what I can only call Mock French Seams.
Today I am using it to seam perle-embellished tulle for a costume. (Yes, I'm sewing a seam with the narrow-width zipper foot. Nothing else sneaks by those stapled perles so well.) This looks a lot like a regular French seam, but only requires one pass under the needle. You just place the fabric right sides together, roll the edges together a quarter inch and then re-roll it again. Pinning A Whole Lot! At least on the tulle. Then edgestitch along the fold. I should have thought of doing this on the other seams of this skirt! It's a lot less fraught than the regular French seam, since the tulle cannot be pressed like some other lightweight fabrics.