Ah, silver shadow! Silver shadows are a must when creating a true smoky eye effect - especially when you have hazel eyes. Silver is wonderful, because it blends so beautifully with so many other eyeshadow shades. Try using silver as your base shadow and then blending some of these other hazel eyeshadow colors over it. If you're really going bold, add a super-dark gray or even a black eyeshadow over it.