Did you ever see a blue foxglove?

Thank you all for the tips about soil ph and turning pink hydrangeas blue.
 
I know this must be a dumb question, but why is it only hydrangeas that change from blue to pink and vice versa? Given the propensity of our soil to turn things pink, how come we have any blue flowers at all in our garden?
 
I’m not surprised that, growing in our garden, this foxglove is pink. But did you ever see a blue foxglove?
 
Just saying.