CIM Ming is the 'replacement' for French Blue. Cornflower was closer if I remember right, but I do not see that on the site?? Ming is an opal (opalino), I wish they didn't stop French Blue as it was not an opal.
Here is Ming
http://creationismessy.com/color.aspx?id=50
And I've never tried Dark Periwinkle but I do not think they would be close at all.