The images of your two backsplash choices did not attach. Please try again.

Any time you add color to something as permanent as tile, there is a chance you will tire of it in time. Use a contrasting neutral, lighter than your counter tops and cabinets and accent with blue. What you place ON your countertops you can use your blue accent and it should pop against a neutral color tile. There are many designs in placing the tiles to give you style if you want something other that the standard grid lay out.

You have got a nice space for putting the tiles on the diamond. Most people only have 12 1/2 inches but you have an opportunity to use more than one size in your design.

I found your attachments in another thread and wanted to help you add them here. I know you posted this a few weeks ago, but I'd love to know where you are in the design process now. Did you make your final selection or are you still deciding? I think that seeing the rest of the room really helps and you can't go wrong either way. The blue would make more of a statement for sure, but both would look great.

They both look great, but the brown would look great, you may get tired of the blue, plus the foiling in the background gives it a lot of pop. I have used that exact blue mosaic