Gray kitchen floors near shadowy green counter tops. what color should i paint the walls?

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well since you have threatening colors, i suggest that you use white on your walls for a sophisticated and modern look... you might think white is plain but there are wonderful high gloss pearly whites that look nice
What should I do near a tile setter...
lighting blue or yellow

How would i alter my room?
Decorators tell us to use darker colors at the floor and walk lighter as we go upward in a room. That is the path natural colors are, getting lighter toward the sky. I think a deeply pale tinted green with white ceiling. The dark green counter would act as elocution.

Try taking a pic of the wall that has the counter. Upload it to your computer and play a bit with the wall colors surrounded by your photo editor.

This has saved me a bit of time, especially choosing accent.
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Answers:    play around with the Sherwin Williams color visualizer to find something that you like. It is the best paint visualizer on the net, imho. I like how their color palette is laid out, I like that you can dig out by color family & color name, the "painted" rooms look the most authentic, and it suggests coordinating color schemes. You can literally spend hours:
http://tinyurl.com/6egjud

I think a light blue like "mountain air" (# 6224) might look nice.

You can also take a photo of your house & upload it to the makeover gallery on this website:
http://www.roomvues.com/
You can return with color suggestions & they'll photoshop them onto your room so that you can get an idea of what it will look close to.