those dresdens look very interesting ...the photo on the extreme right looks so very close to some reproduction fabrics I have seen ---- the yellow looks identical to a yellow I used in a fan quilt in the late 70's......I don't see how many people would be able to tell whether it is a repro or not, so I think you could get away with using repros to finish it--I respect your interest in finishing it with old fabric, I would try to do the same -- but, if you can't, I wouldn't lose sleep over it! I suppose the question is whether you can live with that? There are no quilt police!