The blue one is dyed. I hope that they told you that when they sold it to you! Orchids don't naturally occur in a true blue, but usually deep purples that are very nearly blue instead. When it reblooms, it will be white, with a red or purple lip.
Yes I know the blue one is dyed. I just loved that specific plants color when I saw it plus got it for $5. And I am OK with it coming back in white.
Here are a few that I currently have that are not in bloom at the moment that are as close to natural blue as you are going to get...
Phalaenopsis Royal Purple
Phalaenopsis equestris var. coerulea
Phalaenopsis equestris var alba