Looks good. I think a pearly white fabric paint, like Jacquard makes (their Luminere line), would blend the pixels right in... .play on scraps first, as the pint may not take right if fabric hasn't been washed. If stiffness does not bother you, some of the t-shirt type paints would be more opaque.
if the panels do not line up perfectly, you may want to explore a stained glass look. I'd love to see it when it's finished, too.