So are you cool or warm? Cool complexions usually have "blue, violet or gray eyes," says Los Angeles makeup artist Lucy Crawford. Warm complexions usually have brown, green or hazel eyes and tan rather than burn in the sun. But rules were made to be broken, so here's a second test: Hold a white sheet of paper to your jawline. If you see pink or blue in your skin, you're cool; yellow or orange means you're warm. Now remember your undertone and find your makeup colors:

Skin color: Light
Undertone: Cool
Shades to try: Pinky cream and nude, (like Lorac Eye Shadow, $16, in Harmony) or icy blue, platinum and lavender, (like CoverGirl Eye Enhancers 1-Kit Shadow, $3.30, in Lavender Twist)

Skin color: Light
Undertone: Warm
Shades to try: Sand, warm beige and gold, (like MUD (Make-up Designory) Eye Color, $13, in Spanish Gold) or peach and apricot, like Bourjois Paris Ombre a Paupieres Wet and Dry Eyeshadow, $14, in Ambre Nude.)

Skin color: Medium
Undertone: Cool
Shades to try: Gray, silver and cool bronze, (like Urban Decay Eyeshadow, $16, in Stray Dog) or blue-green and teal, (like MUD (Make-up Designory) Eye Color, $13, in Pacific.)

Skin color: Medium
Undertone: Warm
Shades to try: Yellow gold, peachy vanilla and cappuccino, (like Debra Macki Eyeshadow, $19, in Confess) or rust and khaki, (like Tarte Eyeshadow, $17, in Peyton Place.)