I was just in a friend's office, and she was perusing a variety of drinks for a bridal shower this weekend. The bride's color is turquoise, so she's looking at recipes with Blue Curacao.
The common combos seem to be variations on vodka and lemonade. Options with orange juice seem like the color would be unappealing.
For a crowd, I would lean toward something like vodka, frozen lemonade concentrate, and seltzer.