Well, I got my first pigment about 5 years ago (Frost)... I was kinda out of the pigment loop, until this past Christmas. So, with the exception of Frost, I have amassed all these pigments in the past 5 months...
All Girl (*****) I love it so much I bought a spare
Kitschmas (***) Didn't think it was quite worth the hype
Rose (*****) One of the most versatile pigments, IMO
Fuchsia (****) Great bright pink
Bright Fuchsia (****) Got a sample & love it, I NEED a jar now
Fairylite (**) Kinda blah
Violet (*****) Violet really makes blue eyes pop, so I bought a spare
Frost (**) My very 1st pigment, I've had for over 5 years
Pink Opal (***) Very subtle
White Gold (***) Very subtle
Dark Soul (***) Great for a smokey eye
Maroon (***) Pretty, but very dark
Melon (***) Great natural color
Tan (***) Great natural color
Blue Brown (**) This is so neat, but I'm not into browns
Vanilla (***) A great highlighter
Golden Olive (**) Pretty, not my color, personally
Old Gold (***) Very neat color, don't know what to pair it with
Teal (****) Just got this and love the color, haven't played with too much
Deep Purple (****) Much more frosty than people said, I like it
Grape (****) This one is sparkly & very dense
Deep Blue Green (***) Neat color, very, very dark
Steel Blue (*****) Great blue, gold sparkle like Rose
Blue Storm (**) A bit too dark and blah for me
Blue (*****) Love it, had to buy a spare
Kelly Green (****) Like it much more than I thought I would
Frozen White (****) I like the blue/violet sheen to this one
Coco Beach (***) Like I said, I'm not into browns
Cornflower (****) A very pretty blue, not too dark
Pink Bronze (***) Interesting color, too orangy for me
Gold (**) I haven't found a great use for this one, but I'm trying
Ruby Red (****) love it, but why can't MAC have a truly vivid (frosty) red pigment???
Pink Pearl (*****) Oh I love it, I only have a sample & NEED much more
Copper Sparkle (****) I like this one, great sparkle
Silver (****) Metallics rock
Platinum (****) Metallics rock
Copper (**) Metallics rock, although this one less than others
Naked (*) Got a sample and will *not* get a jar of this one, so blah
Some of my pigment collection...
http://img.makeupalley.com/8/2/8/6/297606.jpeg