Jonas,

I like the idea of trying to tie the rooms together through color. Architectural Ceramics could be a great resource for you. We have several glass tile patterns and colors to choose from. Glass is a great option for a backsplash, because it's so easy to clean and care for. Depending on your timeframe, ACI has stock and special order options. Check out our Houzz page, or visit our website at: www.architecturalceramics.com!

All the Best,
Libby, ACI Designer & Order Manager

Jonas--Given that your cabinets are light oak, your idea of an accent wall can work. I like the idea of pendant fixtures over the island, and the glass tile backsplash. Check out my page, as there are a couple of kitchens that will give you some ideas, in terms of color and pendant fixtures, that are similar in scope to yours. I would go darker on the window wall, and lighter on the long wall of the kitchen and family room. The 45 degree wall would be easier to define the color if the cabinetry stopped there. I would consider some sort of lattice between the top of the end upper cabinet and the sloped ceiling, which would make the color break more logical visually. Happy Houzzing.

Jonas, Granite Transformations actually specializes in mosaic, subway tile and other various cuts of Glass backsplash. When a backsplash is added it can in itself become a work of art and rightfully so...There are many different options and we would love to be able to help you select the perfect choice for you and your kitchen...Please visit our page or call for a Free In -Home Consultation...Have A Wonderful Day!

Thanks to all of you! Secondly - would you suggest I remove the existing 4 inch laminate backsplash before installing the tile or should I just tile from the top of the existing backsplash to the bottom of the cabinets?

Ideally, I'd remove the 4" backsplash first, but only if you can do it without damaging the counter underneath. Otherwise your backsplash tile might not be wide enough to camouflage the lines left on the countertop.

Here is one idea with a blue / gray tone.

It's definitely a cleaner look to remove the 4" backsplash before installing your tile. Removing it gives you more space to work with for your glass tile. Typically, without the 4" splash, you have 18" to work with from the top of the counter to the bottom of the upper cabinets. You'll also gain more space between the counter and the trim around the window. You can use a bigger tile under the window without the 4" splash, like a full 3x6 tile. Otherwise, keeping the splash may result in cut tile under the window. Or it limits you to a smaller mosaic to avoid cuts. Hope that helps!

Here's another grey/blue tone color from benjamin moore Grey Owl