I see it spelled both ways, and spellcheck doesn't care. So, I looked it up on line. Seems either is right. Grey is the English way of spelling it. Gray is the American English version, wanting to be more phonetic at some point. That being said, here is that yellow and grey or gray quilt top I need?
My inspiration came from Hyacinth Quilt Designs, Garden Fence. I left out the sashing, added a larger border and made it square. I'll just add that to the "need-to-quilt" pile. Baby isn't due till December and I hear the nursery is being decorated in yellow & grey or gray.