Traditional window treatments such as swags and tails look wonderful in a period home, but can be out of place and too fussy for a modern home, where a simpler design can be far more effective.
Fabrics to consider in a traditional scheme include damasks, silks and embroidered floral silks and velvets. The colours are also important - rich reds or deep blues and purples will give a very opulent period feel to a room.
Poles can be very decorative and elaborate - heavy wooden poles with beautifully carved finials and holdbacks.
Headings to choose from would include goblets, swags and tails and curtains with attached valances - either goblets or pleats.
Pelmets can be more detailed - shaped pelmets as elaborate as you wish to be!
Trimmings can be very much a part of a traditional window treatment - fringes and braids can be used to edge both the curtains and any pelmet, and tassels can also be incorporated - smaller tassels within a pelmet design and larger tiebacks to sweep the curtains back. An attached valance can look very effective with a bullion fringing along the bottom.