Here are a few of my personal favorites, these are the shadows that get regular use.
Ricepaper- My absolute favorite! Highlight, OMG I have to leave in 5 minutes all-over color, lid, crease
Shroom- Great versatile color
Amber Lights- Sometimes on my inner corner, wore it in my crease for my wedding
Woodwinked- Usually on my lid, my lid color for my wedding, fun for going out, sometimes on the inner corner.
Espresso- usually used in my outer v or contouring
Satin Taupe- for the brown smokey eye
Humid- green smokey eye paired with Deep Truth in outer v
Expensive Pink- IMHO, the best pink in the regular collection, good for everything
Henna- from the BBR collection but there is a dupe in the regular collection, I love to contour with this and shroom.
Sketch- good for the purple smokey eye, I like it in the outer v with stars n' rockets in the crease
And it's not mac, but it fits in the palette, Half Baked by UD. Very similar to FLip from the BBR collection, imo.
BTW, I swore I'd stop at two. I am at 5 full right now
Good Luck!