Looking at these samples, it's my preference that "random" be in smaller formats. The patterns in larger tiles that best fit my aesthetic sense are the ones that have a pattern that I can say in words somehow: "each row moves X farther to the left", or something like that. It would seem that to me generally the larger the tile in these samples, the less formal and more in-your-face the wall becomes. The tiles in the nearly-same colorways are less aggressive and stay more in the background. But that's also true of tile in general--there is aggressive color and there is gentle color. At one time I had my heart set on a set of 4" square tiles from HD: off-red, off-green, light blue, golden yellow, and maybe a couple more. (Colors in last year's stock.) I wanted to do a pattern in these of some kind. But then, this was only to be under-cab for two sides of the room and behind the range, one of the decor ideas I enjoyed and then abandoned while waiting impatiently for months of construction to end. You see this kind of effect occasionally and it's always marked "not for the faint of heart." I had samples here and I arranged and rearranged them, but usually came back to a single line and not a whole wall of the multi-pattern. There's a great wall of strong assorted colors in square tiles in the Modest and Quirky thread that many posters really love. Wish you well. Let us see your finished wall?

That is one nice kitchen! Your granite and other finishes are fabulous. I don't think I've ever seen another kitchen with that much countertop space. I think you should invite your fellow GWers for wine tasting. Looks like you have a nice supply chilling there. Congratulations on your new kitchen

It's difficult to help pick colors based on computer screen and picture variations, but I think the bold colors take away from your pretty tile. I personally like a gray-blue or gray color when looking at your tile. I played around with Sherwin Williams color and found these two as an example: All of these colors will vary depending on lighting and larger samples help make things easier to see. Once you settle on a few colors, get some sample cups and paint poster board edge to edge leaving no white border. Place it around the room and see how you like it!

You might consider these? But they would need careful testing in your space, as they are prone to colour shift in imbalanced light. (Not directly on to the walls though, but either on board or Paint,Peel,Stick decals, so that you might move them around) Nature mixes warm & cool colours together successfully all the time,,,