Paint walls the same color as the white cabinets. Here is how to test for the perfect paint color: http://www.lindaholtinteriors.com/2011/07/testing-wall-color-101/

Keep all accent items on counters (pottery, flour and sugar containers, coffee pots) white. This photo shows some green accents but I would keep most accent colors white.

I like TanCalGal's suggestion, painting the walls white will also make the kitchen look brighter and bigger

Thanks to the both of you! I had similar thoughts of the walls being white.