Years ago, probably the mid 70s, a friend and I overdyed calicos that we hated; Rit (? not sure that's the correct spelling) dye in a tan/beige; loved the results and used in many quilts and it's held up well.
I have since baked muslin with coffee dye, successfully. Don't ask me for instructions, I can't remember. Have them written somewhere; when found, I'll post.