You probably look at (or through) your kitchen window more than any other window in your home. And so it's nice to get it looking attractive, and not just to make do.
In certain situations the window may look fine as it is, and may not need to have any sort of treatment. Perhaps you look out into your own garden and you're not overlooked. Some modern or contemporary kitchens look great with nothing extra at the window, especially ones which are more architectural in nature.
But usually you'll need to do something with it, even if it's just a simple shade or dress curtains.
Options for your kitchen window
It's best to think about your kitchen window at the same time you decorate your kitchen . As with bathrooms, you may only need a simple roller or slatted shade, or Roman shade.
Usually you want the shade or curtain to be completely out of the way so it doesn't get splashed or get in the way when you're working. If your window has a recess then it makes sense to fit the shade or curtains into the recess. It's often the case that there isn't much room to do anything else, as kitchen fitments often go right up against the side of the windows.
Leave it as it is?
On the other hand, you may not need anything at all. If you have a beautiful view from your window, and no one overlooks you, then consider leaving the window as it is. Of course, you may wish to have something to shut out the night or give you a certain amount of privacy - it's a personal choice.
Not too plain...
If you find that roller shades or roman shades are just a little too plain, think about finishing off the bottom edge with a contrasting border. Roller shades can also have a shaped finish, such as a scalloped edge.
A little softness
Unless your kitchen is a country style or rustic, keep your kitchen curtains as simple as you can.
If you want something of a more decorative nature and you don't have the room either in or around the window, you could have a pair of false (or dress) drapes which don't actually pull together, but are tied back permanently. Then fit a roller shade behind the drapes which you can pull down when you need some privacy. This way you get function with a little softness.