Paint colors are stressing me out.

Here's a quick run-down of what I'm thinking for color choices.  The problem with our house is that every wall is white.  In all of the other houses we looked at, I liked most of the colors of the walls and knew I'd leave a majority of the paint colors the same.  However, in our house, I literally have  blank slate.  There is nothing, nada, on the walls. 

The kitchen

   

I am doing a striped accent wall with these colors, with the second color as the "base" and then using the other 3 colors as stripes.  Then I'll use the base color throughout the kitchen as the kitchen wall color also. 

Living Room

 The walls will be this color
 And then the wall that has the fireplace I'm going to do a couple shades darker, so something like this.  I would rather do a color, but I can't figure out what color to do without it being so permanent that I can never change my decor.

Office



Blue!!!  Crazy, huh?  This isn't the exact shade, but I'd like to do a slate blue of some sort. 

Basement



I'm not completely sold on this, but we want something light and airy since the basement is so open and bright.  Any other suggestions?

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So, what do you think? Likes/dislikes?  HELP!!!