Hmmm, I'm going to suggest that you check out this site.
There are a few matches that I think might interest you. Namely Cameo White, Kingsport Grey, Barista, and Silver Spring. I would love to see samples of your finishes to be more helpful, but this might point you in the right direction. Good luck!
http://www.benjaminmoore.com/en-us/for-your-home/pottery-barn-paint-colors

I just panted my dining room Storm by Benjamin Moore in the matte finish. Use matte, which is a washable flat or flat. Any finish with sheen reflects light, which both reflects light and shows any imperfection in the wall. Storm is a medium tone and furnishings shine against it. Love the panels you picked out.

Good luck!

I have these drapes as well in our family room which is open to our kitchen. We used Benjamin Moore Puritan Grey on an accent wall and Bennington Grey on all other walls. These colors look great with these drapes! Hope this helps!

Try Edgecomb Gray with Revere Pewter.

I like BM thunder AF-685 it is a brown-gray would look great with the curtains.

It's a good idea to start with a fabric or upholstery color and match the paint to it. I got very custom paint colors and am having a hard time finding fabric that works well.

I think the dark gray on your kitchen walls will be stunning with the white cabinets. You didn't mention a back splash. I'd throw in sparkle with glass mosaic tiles incorporating the white of the cabinets and the gray of your counters.
Benjamin Moore website: Wythe Blue. They painted this blue with a gray crown molding in a dining room. This will give you an idea how your gray kitchen and blue living area will work together.
When I chose paint colors I took several variations of the color cards and checked them against the counters and floors. I made sure they worked together and with the other surfaces. I checked them at night, in the morning, and afternoon. Then waited a week and checked to see if I still liked them together. A friend of mine bought samples and painted wide stripes side by side of her choices before making her final selection.
For the powder room you might try the brown in the curtains. White towels and brushed nickel fixtures to lighten it up.
I hope you'll let us know you're final choices.

Be sure and at least check out BM Horizen and titanium. They are light greys and I used them in my new home and they look good and are soothing and serene.

Here is a photo of the titanium.

Clearly you love your drapes and the colors in them are lovely. but unless you want a monochromatic palette I think you need to step away from using all the same colors already in the pattern. I would move into other colors from nature & let the idea of the drapes (i.e. the leaves) guide your selections. Look at muted shades of green (moss), yellow (umber), orange (sienna) and blue (slate).

I think for cohesion sake you should use one color as the primary choice in each room but add touches of the remaining colors so that the rooms have a through line and relate to each other. You can do that with pillows, frames, books, planters, etc.

I note you've already decided on shades of gray, but if a deep rich taupe is a possibility, we just used Sherwin Williams "latte" and we love it. Very neutral, but has interest and goes with everything we own. Just a thought. Coeur d'Alene Jane :)

In the kitchen, make the ceiling a lighter shade of the gray...when using white cabinetry, also use white crown moulding, it will make the room come together---it's a wow factor!
I like to use flat paint, in a kitchen,(ie, if you use the Mr Clean's white sponges, they take the shine off the paint.)*esp if you have kids or grandkids. (Teen-agers touch the walls more often the younger kids!) LOL

I can't see the exact shading of the colors of the drapes online but I saw them and just painted an extra bedroom a GORGEOUS shade of gray with a hint of green. I matched to a comforter and have had SO many compliments. I love it so much I could just sit in that room all day! The color is by Olympic, sold at Lowes : Silver Threads. But I had it mixed to Glidden Duo eggshell paint, which by the way is excellent. [you can mix it to Benjamin Moore as well. all paint companies will mix others colors] http://www.olympic.com/Home/Search?q=silver%20threads
If you want to stick more to what appears to be a bluer tone in your drapes [excuse me I am blind - lol] you should check into the same color range but with a bluer tint. Mine leans on the green side but still looks great with the blue accents I incorporated.
I also bought color for an accent wall as well but don't want to mess with perfection. LOL. The room I have it in gets a lot of sunlight and the color is awake and bright by day but at night it turns into a great muted mood tone. This color is so pretty it will make you want to go out and buy new curtains if it doesn't already match them! LOL Best of luck with your search! Hope this helped. :)

I have used a color in my last THREE homes called SPICED VINEGAR. It's actually a Pittsburgh Paint color but you can get a sample and color match at BM. It has a slight gold tone, VERY subtle, and acts as a fabulous backdrop to any and every color I have accented with. I even have my Real Estate agent using it on his home.

I have these drapes. They are in my dining room next to tan paint called gobi desert and in my office next to chocolate brown. Both look great. My iPad won't let me attach the pictures, if you post your email I can send them to you.

Are you sure about blue in the living room? Do you want people to go to sleep, or do you want stimulating conversations? Even one of your grays would be better, although I recommend a warm color.

Thank you for all the great ideas! I'm in the process of choosing the kitchen countertops so once that has been selected I'll be using these tips and suggestions.