I had one Follis (the only one I owned) that was a very nice bike. It was all 531 and had some really distinctive lugs with the words FOLLIS and LYON pierced through the top and bottom headlugs...it also had an aluminum headbadge which seemed a little "overkill". If yours was a top-end Follis, I'd say restore it to its Gaullic Glory and ride it. Given that Follis also made a load of mid-to-low-end stuff (and that's more likely what you got) then make it a fixie or a frankenbike, long as it stays out of the landfill and gets ridden by SOMEbody.