Wow I

LOVE

the packs! What a cool idea

!
Seems like you could change it around in a lot of different ways, too. Like a pack that has all eyes, or one that has two small things like matching eyes & lips instead of one big one like hair, with maybe only three or four colors per pack for those since you are getting more.
Or the color sets offered could have varying themes
(? sry pre-coffee not sure that's the right word) like rainbow & monochrome (blacks whites greys), brights & pastels, warm/cool/neutral mixed color packs, seasonal (spring summer fall winter colors), selections from each color range (reds, blues, browns, etc), the various ways of picking color schemes: complementary, contrasting, analogous and so forth.
Or maybe I'm just overthinking all of this

Regardless of that, it's a great idea and I hope you sell lots of sets! It spurred me to donate this month, that's for sure.