Just as a thought that you may consider ............ I've seen white whole cloth quilts that have been quilted with a colour (blue, pink and even red) that just seems to make the quilting sing ... and yet it still keeps a subtle look.

As always, try a practice piece and see what you think. I haven't done white on white, but there are many beautiful whole cloth quilts done that way. I have done the black on black and even though it is a little hard to see, some how it works. I think it is just concentrating on the small area under your needle and the light. In fact, I am about to start another black on black soon for my DGS.