Nice pice, but as Jorge said, they tend more to the purple than actual blue. Have seen some vandas with a nice delft blue 'crackle' finish on white. Don't recall ever seeing a real blue on anything else. Could be that, like the 'blue rose' that is actually shades of lavender that there isn't a blue gene to breed to. This may be the case with most orchids--no blue gene to breed to.
Have heard of the genetics people trying to separate a blue gene from lobelias and delphiniums to try to splice into to create a blue flower. Though this is cheating, there is money in coming up with the first flowers in a color that does not otherwise exist. One day we may see a 'frankenblue' orchid or rose.
Ethics of it all...don't even want to go there.
