When staying in Switzerland the curtains in the chalet ran on a rather clever rail. it was set into a piece of wood, a bit like a pelmet, so from the front you saw the wood. Standing directly underneath it you saw the recessed tracks, two so the voiles were on their own track. It just seemed particularly clever- very simple, no unsightly tracks, no fussy pemet.
I know I'm describing it poorly but does any one have any ideas? Think it was ceiling mounted too.