I don't have step-by-step pics but those bar bows look like they're made like this to me:
1. Out of your 3/8 wide ribbon, cut one piece each of 1 3/8" long, 3 1/2" long, and 6 3/4" long (for lining the clip - I line my clips differently and they only take 4 1/4" though)
2. Seal all your ribbon ends and then line your clip.
3. Make a circle out of the 3 1/2" long ribbon by glueing a small bit the two ends on top of one another. We'll call the glued-together part the middle now. 'Smush' the circle so that the point opposite from the middle meets up with the middle. Glue in place.
4. Glue this new bar bow shape on the clip where you want it and glue the center of the 1 3/8" piece across the middle. Wrap the ends of the 1 3/8" piece underneath the top prong of the lined clip and glue in place
Hope that made at least a bit of sense! (I still need coffee...)