Are you looking for primarily solids? I use small prints on white or cream or tan or gray for my neutrals. They may be too wild for this group. I'm pretty crazy with my neutrals, a la Bonnie Hunter.... Here is an example of what I'd use for neutrals:
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Anything with a neutral background reads as neutral in a quilt. Most of these I pulled from your color swap baggies! I just set them aside in a neutrals collection. Please be honest and let me know if my idea of neutrals is too wild for you. I don't want to ruffle any feathers. And I can send tamer ones....