In difficulty order, it ought to be:
Black, Red, Blue,Green
These should be all gromed runs.
No idea about lavender and yelow (probably intermediate difficulty level between Red and Blue?) but as said, to see
the map, or even a link to it could give us a better idea.
But, if the yellow is like the orange you see in this mapMadesimo ski area
Then those are off-piste trails(out-of-bounds, I remind you that virtually everything that lies outside of a groomed trail is off-piste here, and you'll notice many signs, in Italy, saying "Vietato il fuoripista"- "off-piste forbidden").
You'll notice a couple of runs that are black and oange, well, those used to be in-bound runs that have been re-classified as off-piste. That means that by the city mayor decree, the run can be declared closed for the day or the week, and no one is allowed to ski down it, not even at his own risk.
That's one of the reasons I don't go there to ski anymore,
I see no use to drive there (and by the time you're there it's too late to drive anywhere else), pay an expensive ticket and discover that the more interesting runs are closed.
I may give the place another try, in a while, after the sour taste of last time (February 1999) has definitely faded.