Yours might seem like a really off-the-wall question, but I understand your concern over colors. A PhD friend of mine told me that women are so into color because they have more color receptors and can perceive minute differences in shading over their male counterparts.
I like the grey/green/yellow idea, but be careful of your yellows. Yellows that look like straw or tan colors on a paint chip can look like lemon yellow on your wall. My suggestion would be to go to the hardware store and spend an hour or two looking at their paint chip strips. When you find a color that makes you feel all warm and fuzzy (like grey greens do for me) then try to match it with a corresponding green or yellow (I would pick a more chamois color rather than banana yellow). Bring home your color swatches and tape them to the wall to see how they look in your light. Then, you can go so far as to ask the paint department to mix up a small batch of the colors you feel strongly about and paint a square foot or two of your wall. Let them dry and observe.
If you have a favorite color on a shirt or a lamp or a figurine, you can bring it to the store, and they will do a color analysis and match it. I've joked in the past about bringing my lesser platinum to get them to match that creamy muted olive color as a paint color.
You're right to suggest a trio of colors, a base, and a couple of accents. I painted my living room, then painted the walls that do not face the light a slightly darker color, and used the darkest accent color for the fireplace wall.
People can suggest colors, but really, it's pretty fun going to the store and faced with all of those choices, picking several candidates and trying them out. You can also do an internet search for a color visualizer, and it will allow you to select a representative type room from their pictures, then use their color pallette to change the walls and trim to see what it might look like.
Have fun!
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