So here are my favorites, starting way back in 2004.
2004
Adorn
2006
Danse
2007
Racquel Welch
Barbie Loves MAC
Balloonacy
Strange Hybrid
Blue Storm
Smoke Signals
Royal Assets
Antiquitease
2008
Fafi
Heatherette
2009
Hello Kitty Wild
Hello Kitty Mild
2010
A Tartan Tale
A Tartan Tale Chapter 1
Venomous Villains
To The Beach
2011
Quite Cute
Surf Baby
Semi Precious Eyes
Glitter And Ice
2012
Shop MAC
Chen Man
Hey Sailor
Heavenly Creature
Marilyn Monroe
Glamour Daze
Primped Out
2013
Temperature Rising
Tropical Taboo
Indulge
RiRi Hearts Fall
RiRi Hearts MAC Holiday
2014
Kelly Osbourne
Sharon Osbourne
The Simpsons
2015
Wash And Dry
MAC Is Beauty
Cinderella
2016
Trolls
It's A Strike
Selena
Mariah Carey
So these are my favorite collections so far. Do you have any favorite MAC collections?
Images from Chic Profile, Temptalia and MAC Color Story Collections