Now I need to choose, or try again.
I think I'm suffering from an excess of feedback! I took the fabric at the bottom and the quilt to the Neighbourhood House yesterday. I got some definite "YES" responses, and some equally definite "NOs". The other fabric was still on the line drying at that stage. I'm inclined to choose it, even though it's not quite the right colour. I do have plenty of that fabric, though and still have today to experiment. I've worked out that I can leave half the fabric as is--to use on the quilt if it turns out to be the best option--and overdye the other half with a slightly different green. To do that, though, I'll have to clear the sink again.