Such a nice space. What are your needs? Are the window treatments strictly decorative? Do you need to protect furniture and rugs from the sun? Do you need privacy? I think you can use different treatments to differentiate rooms but I do think plantation shutters look best when they are used through the whole house. They have a lot of visual weight and I think it helps to make the room look balanced when they are used on all the windows. And since I am OCD, I also like to consider how my window treatments will look when facing the front of the house. I wouldn't worry about curtain panels just yet. You'll be adding rugs, furniture and art which will add different textures to the room. If you decide you'd like panels you can easily add them at a later time.

I would go with a fabric drum shade. Here's a guide on how to pick the right size shade: http://www.apartmenttherapy.com/how-to-choose-the-right-size-lamp-shade-apartment-therapy-tutorials-107600

You have: WARM travertine tile on the first floor. You have DARK warm wood cabinets. You have WARM countertops. The LAST thing you want sitting next to that BEAUTIFUL WARM coloured stone is gray. No gray. Nothing in your home says "I need gray to make it perfect". Nothing. Your furniture will change. Your area rugs will change. Your wall colours will change. They will all change inside of 15 years. But your PERMANENT stone or tile floors will STAY. If you must use a tile next to stone, I suggest working in the same tones. You can go darker or you can go lighter but stay inside the SAME TONES as the travertine. If you REALLY MUST HAVE GRAY - then rip out the travertine and start again. Gray and peach stone/tile do not like to play nicely together. It screams out, "I didn't want to pay to do it properly." I would recommend finding MORE travertine in a different sized tile and add it in at an angle (diagonal install). You can find a stone that is either a little darker or a little lighter. You can then add a decorative boarder to the rooms where you are installing it so that it looks like you did it on purpose. This is a great way to add more of the high-end stone to a space that already has high-end stone. But please do not add gray in with peach. They just don't like each other. Flooring snobs, like myself can see it right away. We KNOW when something has been done piece meal. We also know when someone did the piece meal NICELY vs. someone who did it without a thought to the overall look of the floor. Compliment the stone you are keeping. Let your area rugs turn the space gray. That trend is quickly dying. It makes sense to throw out a rug in 3 years. It doesn't make sense to rip out a tile floor in 3 years.

Do it up right since it is important to you. Take it to a lamp store or contact Fenchel shades to help you decide on color and shape.