Match the lightest tile in the back splash. Here is how to find the best paint color: http://www.lindaholtinteriors.com/2011/07/testing-wall-color-101/

can not see color of backsplash. are you happy with above answer? floor is light wood, correct?

Here are some better pictures

Floors are lighter than the cabinets. Without having white cabinets, I'm hesitant as to whether the lightest color of the tumbled marble will look good as the wall color. The lightest color in the tumbled marble would be the color on the doors and trim, Botany beige.

It is usually best to repeat colors that are fixed.

If you feel repeating the lightest tile color does not float your boat, choose a darker tone. Maybe one of the other tile colors or a color that is slightly lighter or darker that one of the tile colors. The wall paint color does not have to exactly match the tile.

I think the gray, Gull Wing, is an attractive gray, but I do not see it in the tile or anywhere else in the room. Be sure to use Linda Holt's method to find the perfect wall paint.

The yellow just isn't doing anything to highlight the cabinetry. I'd go with TanCalGal and choose a color that's already in your backsplash. Go to Lowe's or Home Depot and get 20 or so color chips and match a couple to your tiles.