My personal favorite is Royal blue, and I've been collecting all shades to make a quilt for my sister, hopefully I wont hate the color when I'm done.
My Grandmother's favorite color was orange. Yes, that's what I said. So the more and more that I work with fabrics the more I notice beautiful Orange colors. But trust me whenever an orange block goes into the sewing machine I blubber and cry like a baby. I miss her very much.