I would go with a very light spa kind of blue. Keep it crisp .. light .. pale blue/white .. nice white towels. Get new pics with white frames ...would go with your painted mirror as well.

For a kitchen, my favorite is a roman shade. It gives you the beauty of fabric with the function of a shade.

No window treatments are going to give "total darkness" Anyone who sells you something and says it will is a liar. Even the best blackout shades installed with side channels will block (maybe) 90% of the light coming in a window. Call a local professional to come out to your home with samples to look at. Best options will probably be a double-cell honeycomb shade or a roller shade.

bamboo or woven roman shade in a medium honey color with lots of texture would look lovely, casual but tailored . Not too overpowering for your subtle wallpaper which is beautiful. dont forget privacy liner. most bamboo or matchsticks are see through.