I've had a few creme leg bars. All three came from same hatch, same source. Two of them developed strange tumors and we had to cull them. The third also had some strange growths, but seemed healthy otherwise....my point here is that they seemed susceptible to something, or else had some genetic predisposition to something unhealthy, however, the rest of the 30+ flock of various ages and various breeds from various sources never had these issues. The eggs from these were a very pretty shade of blue.
We had one Frost White Legbar from Meyer. These are creme leg bars that are a "sport white", but they are creating their own line of "Frost White Legbars". She laid the prettiest and most obvious shade of blue we have had. She ended up getting some kind of abscess on the side of her leg (around her "ankle") although no obvious source of infection or injury. We doctored her repeatedly, but then the infection became very bad and we had to cull her so she would not suffer.
We have had many EE over the past 3 years from a local hatchery. Some lay green eggs, some laid medium olive color, one laid a grey egg, and some have laid vey nice blue eggs. So, for color variety, the EE win the award!
However, the best, brightest blue eggs we had were from the "Frost White Legbar" from Meyer.
FWIW, the Araucana breed mentioned above by
@Awakening Forest, when true/pure will lay blue eggs - no other color. They are rumpless and have distinct tufts protruding from the neck. True Araucana are rare. It is my understanding that there is a problem inherent in the breed causing reduced hatchability/viability. To get around this issue, Ameraucana breed was developed, for the blue eggs, but a more robust bird. Then there are EE and all the other colored variations with fancy names at the various hatcheries, which are crossbreeds to get colored eggs. So, you could also try Ameraucana (purchase from a known breeder with good reputation) as well for blue eggs.