I tend to try and be more towards the strict side. I would call only the marble on the right side of the two an Indian blanket.
As for others....being it has come up lately......Subs. Once only Indians were subs, then CAC had subs and now Peltier. On something like this I am less strict as I think the name described a certain action and construction rather than a color combo. However I would be strict in the sense that it had to be a marble which appeared to be opaque yet backlit transparent. Now I have Alley marbles that would meet that requirement but do not call them subs, although I might use the term to describe its construction.