[Jesus]

I don´t know in the PdC area, but in Central Mexico you can find a variety of tortillas with a different color (I will try to find some of different size for you next time), the maize has that color in the begining so the result is strange.
Maiz azul, (blue corn) wich by my standards is green (look at the picture) tastes sweeter and if you have it "corn on the cob" style you don´t put mayonaise nor white cheese, just put some limón and chile and there you go.

This corn is also used to prepare tortillas, they are coarser and the flavour is a little bit different (but not sweet), they are more difficult to handle for tacos, but if they are thick you can enjoy a nice meal.

Here is a sample, a simple way to enjoy: tortilla azul (verde), some avocado and Oaxaca cheese. Is a very tasty experience.

Buen Provecho.