I agree that something other than carpeting would be a good idea- more durable, easier to clean. You might consider Pergo or other wood-like laminate. And, if I were you, I'd keep everything in the same light colors of cream and pale yellow. I think that would look very feminine and relaxing. If you wanted to add another color, I'd consider a pale peach. Hope it turns out great!
Hard floor-wood grain or laminate, or tile. I think a cornflower blue woould be smashing.
Having a carpteted nail salon may not be a great idea. Inevitably accidents happen and trying to get nail polish out of carpet is a nightmare. Consider going with a neutral color tile or some other hard flooring. For the walls, I think a green color would look nice with the yellows of the wood and chairs. Go to http://www.behr.com and look up a color called "asparagus." I think it would go nicely with the colors you describe. Good luck!
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