I've gone through this entire thread and I nominate PG_Cruiser as the best posted in Cruise Critic history. This was an incredible effort.
Some of those drinks only available on Icon of the Seas look great. I'm assuming if you asked for them on another ship, they'd have no idea how to make them. Now with the recipe, they can.
If you run out of official drinks, I suggest continuing this thread with off-menu drinks. A "Berrys and Cream" is something most RCL bartenders know how to make, but it's not on any menu in the fleet. A "Pistachio Martini" is another one the bartenders on the Liberty of the Seas knew how to make that was outstanding. (Sorry, I didn't get the recipe.)
I also have a couple of drinks I instruct the bartenders to make that I have memorized. If anyone else does, maybe we can share them.