a) unpick most or all of it and do the whole thing in a single colour, probably either dark red, off-white or pale pink. I'd lean towards pale pink, which would pick up the binding;
b) unpick most of it and use two alternating colours, say dark red and one of the light colours, or alternatively alternate either light pink with off-white or dark red with purple for a more subtle effect;
c) continue as planned, and then turn the whole thing into whipped running stitch, using the same thread (probably off-white) for the whipping. I'm not sure this would actually look all that good, but it may preserve the effect of the shaded set of threads in some way, and would save me the unpicking. Although it's only about 40 min's worth of sewing to unpick.
It may be worth mentioning that I haven't done a great job of the running stitch so far. It's just a quilt block placed over a piece of white flannel, I didn't put it in a frame due to lack of space, so I've been doing a strange sort of running stitch, not my usual rocking stitch. The stitch lengths are a little uneven, and the lines of sewing get wonky here and there. I have no idea how to make them better, apart from trying to get it into a quilting frame somehow and doing a proper quilting rocking stitch.
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