Since the F/W season is coming soon, you should scope out what colors will be in trend for that season. Those colors should be in the giveaway, as to be current.
Going to neutral route, I have a few ideas that I think would work on MOST skintones (Fairest Fair-> Darkest Dark).
(I assume this will be a MAC giveaway)
E/S
-Carbon, Nehru, or Print ( A dark black or liner color, it's sort-of a given) lol
-Crystal Avalanche, Vellum, or Shroom, or maybe Vanilla pigment(
) (A highlighter color, anything BUT straight up stark white like gesso lol)
-Freshwater, Plumage, or Nocturnelle ( Something dark& colored, for a smokey eye that isn't black)
-Woodwinked, Sumptuous Olive, or humid (Some earthy colors, very flattering on most eye colors)
L/S
-Riveting Rose
-Russian Red
-Saint Germain
-Cockney
-Pink Nouveau
L/G
-Clear lipglass (just to play it safe, and(!) it has a good price to product ratio
)
HTH!<3