And could it be possible to have in the album page a different color for the letters shown in album details (right of the cover)
You can use any color you want. The colors used in the CMI template are basically defined under Declarations (look for the Colors section)

Take a look at the OCD programming documentation at [url]http://ocd.juventas.net/home/index.asp[/url]. It may help you figure out how to edit templates (and themes).