I've noticed some of the window dressings in the cities we've visited and snapped photos of them for inspiration (but can I find them?). We've lived with our large bay window in the kitchen being a bit of a goldfish bowl for some eighteen years and I'm only now deciding I'd like to try for a bit more privacy.
The typical solution here is lace curtains (which Vivien tells me is now 'very old lady'). I don't mind 'old lady' at all but I was thinking more in terms of the Continental approach of just bits of lace in interesting shapes. They wouln't protect from a peeping Tom, but we have a few feet of yard and a brick wall between the bay window and the pavement, so I'm not so worried about that. One benefit of being close to neighbours is that there are lots of people around to observe unsocial behaviour. Besides, I still have drapes that close at night.
I checked out the yarns available, figuring I could manage a granny square or some double/treble crochet. I haven't decided yet how to approach this, as the three windows are different sizes, two about 30 x 40" and the centre window about 40" square.