But let me ask you this--which way would the cut size face? Or do we "buff" it to look like it wasn't cut? Any info would be greatly appreciated. Would the corners be mitered? Being that the field tile will be cut into the design, and the rhomboids would be full tiles, I'd think you want to keep the cut edge out toward the field. I know about the bullnose pieces for the sides, but do people use those along the top, where the backsplash hits the cabinet? Does it look more finished? You SHOULD just about have full tile under your cabinets. There should be just about 18" between countertop and bottom of the upper cabinets. In fact, I'd measure and lay some tiles out dry jut to make sure you wouldn't end up with a gap at the top. Either way, though, Just use field tile at the top. Where it goes up by the hood, you ca just continue the field. If you have other places where it'll be open on top, you can simply add a piece of bullnose to the top of the field tile, so that the bullnose extends up past the bottom of the upper cabinets, as shown in the following picture:

Home Depot has an arabesque tile in a light green that I think could be lovely with your color scheme. I tried to attach a link, not sure if it will work. If you are trying to streamline your kitchen, I would consider removing all of that trim above the cabinets, it definitely makes them much more traditional looking. Here is a link that might be useful: Home Depot arabesque tile

How much backsplash do you have? Although I like the mosaic, if it were the whole backsplash I am not sure I would like it as much - it is much busier than the subways. But that is my preference and I agree if you want the backsplash to be the star, the mosaic will stand out. Other considerations - mosaic is more grout, and you need to be accurate lining up the sheets of mosaic, or it will look off. Have you considered running a few rows of the mosaic through the subway, similar to what you have done with the listello? I couldn't be sure flipping back and forth between pictures if the colors would work together.

I recommend Winchester Tile Company www.winchestertiles.com often and your kitchen strikes me as a perfect match. They have a gazillion options in terms of size, color - I just picked two photos at random: (I'm not suggesting the quilt tiles that came along with the white photo). The second color, by the way, is Hibiscus.