Cross-posting from the Eorzean Cookbook thread:

Elixir: Make it red-orange and tart. The in-game recipe also calls for nutmeg, but let's not bother with the mistletoe.
Ceruleum Cooler: Make it deep blue and slightly milky. Bonus points for setting it aflame before serving.
Atma Weapon: Use four different fruit juices/flavors in red, yellow, green and blue colors, frozen into miniature ice cubes. Suspend a dozen of these in a clear drink. No FATE grinding required!