It is hard to see exactly without being there in person but it looks like you have some gray upholstery in your living room - I would try to tie that in with the sun room. I would suggest keeping it bright and fresh and a gray would do this. As for the color of the kitchen walls, the only way to find out for sure is to check all the paint samples you can find in your home improvement store and the closest one try a sample pot. You can buy clear plastic squares that you can paint with the sample and try them in all the different lights to make sure that is the same color. I wouldn't worry to much about trying to find the colors in the rooms you aren't painting. Get a few sample pots and the plastic squares and then try the gray's in all different lights and spaces to make sure you like it.