how about a piece of stainless steal
or else I’d vote for a khaki color to match the walls, maybe the salmon color of you want it to stand out a bit more

I would go with a slightly darker shade of khaki and maybe have a border row that picks up either the black or salmon.

At first I was going to suggest accentuating the salmon, but I’m afraid that it will clash with the “khaki”. Khaki could lean to the pink or green side.

How about something very near the color of your walls, but adding a few textured or patterned tile which contain the salmon color.

Polished Brass would look really good against that black granite i think.

You say the the backsplash is tile.

You have to either cover them with drywall, beadboard, tin etc etc or retile them

Decorative tins similiar to antique ceilings are very easy and pretty cool, trendy at home depot, lowes and can be easy DIY.

They come in stainless, copper or paintable finish

Installing drywall or beadboard to paint requires a little more ability

Re-tiling is the most labor intensive and costly option, but done in a tumbled marble with metal accents would look beautiful.

An icy steely silvery blue goes very nicely with salmon pink.