Another view.

Anything you don't like about the current color for those areas?

Black

I thought black also. Thanks!

I'm not a designer but a couple of things come to my mind when I read your question and look at the pic. I personally like your white cabinets, and I love white kitchens, but if you'd like to add a touch of color why not adding it in the back splash?

black or a charcoal grey...

A change in the backsplash might be a good idea also. Thanks!

A medium shade of gray maybe even a gray wash.

Black or a VERY dark grey. There's a shade I'm loving right now called Raccoon Fur.

You can also edit the backsplash removing a row of the 3x6 and adding a 1x1 mosaic in a soft tone the one attached is interglass shimmer from inter ceramic you could get 4 linear feet per sheet most places sell it for 12$ or under per sheet you may 3 to 4 this will help keep cost down and give you a fresh look.

Whoops here's is the pic

Looks like you like red ... how about just a red island & leave rest of cabs white:

I do like red! That's very bold for sure.