Never seen it as a slushie in Italy but we do have azure ice cream. It used to be called "puffo" (=Smurf) but smurfs aren't popular anymore, so now they usually sell it as "marshmallow" or "cotton candy".
Surely no visit to a UK chain cinema (Odeon/Vue) in summer is complete without a refreshing and sugar-free Tango Ice Blast?! It's the "UK’S N0.1 FROZEN DRINK BRAND", according to their own marketing.
And the two original, traditional flavours of Tango Ice Blast are Red (Cherry) and Blue (Raspberry).
In fact, I can't remember ever seeing any other flavours, although according to their website there are others:
Blue raspberry is a candy only flavor. It doesn't really taste like raspberry. Its pretty common as a flavor in the us at least, it's one of my favorite candy flavors.
I feel like you might run into it at a carnival or theme park. It's found in things like candy, Kona ice, extremely artificially flavored drinks, etc. Junk food.
What product has "blue raspberry"?
I can only think of one raspberry product I buy, and it doesn't have any dye, and is deep red colored (from the raspberries)