TMBTM:

I personnaly only pay attention to what is shown in the movies, and colored cristals are not mention anywhere.

You're not the only one. If it's not in the movies, I think it's open to change. And anyway, seeing as these aren't exactly wide release projects we're doing, it's pretty inconsequential.

Actualy I never thought the midichlorians are said to BE the Force, they just help the people to be somehow conected to the Force. That's the way they are described in TPM.

The Force itself is not explained by the existence of midichlorians.

I didn't say they were the Force itself, but clearly there's a connection. And if they were, I wouldn't mind. It wouldn't spoil the metaphor of what the Force is, so again, for me it doesn't have to be a nebulous energy field.