It’s difficult to give specific advice for window dressings unless I know exactly what the room looks like. A lot depends on ceiling height, furniture style and decorative elements such as moldings and beams.
In general, though, I suspect that you are correct in not wanting to conceal the window frames. Why enshroud anything that adds character and strength to a space? In fact, it might make sense to emphasize the frames further, perhaps by painting them in a color that contrasts with the walls. Properly highlighted, the frames can become just as important a decorative feature as a well-detailed fireplace mantel.
But even if you leave the frames as is, I would still suggest that the window treatment be recessed so that it covers only the panes of glass. The actual dressing is mostly a matter of personal preference. Swags and jabots, as shown in the photo, might be a good choice and so might a simple floor-length curtain hung on a plain rod. For something more exotic, you could try a balloon-type shade fabricated from a billowing silk material.
In the formal living room seen here, the printed fabric dressing coordinates with the wall covering from Sanitas’s “A Classic Style“ collection. The vine-like pattern calls attention to the room’s ample vertical dimensions and leads the eye up toward the molding.
Don’t assume, however, that the window covering has got to match the walls or that it has to be done in a floral pattern in order for your partiality toward that design to be expressed.
These days, it’s perfectly acceptable for sofas and chairs in all types of settings to be upholstered in a melange of large-scale floral patterns. Such a look has become common even in urban environments, although florals certainly are more reminiscent of an English country home than of a modern city apartment.
I would say you will probably be wise to leave fabric patterns and colors to the walls, carpets and upholstered pieces. Choose a simple treatment for the windows that will accentuate the frames and not interfere with whatever views you may have.
I can guarantee that the floral effect will be more visible that way than if the pattern is all gathered and pleated in long curtains or elaborate drapery.
