I agree with the other posts. Either a white-on-white or off-white would be great. I THINK Hoffman, in their 1895 line has a solid or nearly solid white batik - go figure - - - it's what they use as their base so the thread count would be the same. You might have to ask your local quilt shop.
Please keep us posted. OOOOOhhhh - - - please be sure to PRE-WASH your beautiful blues to prevent color bleeding.
Jane