Littlebunnyfoo--I think that your nails tell a lot about your health status, but I have never had that. Mine are just pinkish and white throughout.
Have you checked into Raynaud's for the purplish look? You stated that when you get cold it happens. Raynauds is an autoimmune condition that causes the nails to change color in response to temperature changes. I think that the hands also change color too, like fingers are white with blue nails. I had a friend once that had this and that is how she looked.
I know that when I get cold, just in the freezer section of the grocery store my fingers turn all sorts of colors. I think that it is normal to change colors. The people that have this RP you can really see it very predominately. FLFLOWERGIRL