I would love to see a photo too - but I'm going to guess that you've got white or muslin for the signature portion and maybe many different colors in the patchwork portion? You could stitch in the ditch around all of the white or muslin blocks and maybe just stipple in a blending thread in the patchwork areas.
I like the idea above of a feathered wreath with the signature inside but that could be a lot of work unless you are really comfortable with the quilting aspect. Is the quilt already pieced or are you planning ahead for the quilting?