If I had to wear one shade of eyeshadow for the rest of my life, it would most certainly be green. The best colour for accentuating my light grey/green/blue eyes and the most dramatic pairing with voluminous, black lashes.
My favourite shade is 'Green smoke' by Mac - a sheer, slightly shimmery shade that looks beautiful washed over the lids lightly or built up for more drama. On days where I want a more true green shade on my peepers 'Khaki' from No.7 at Boots is a buttery soft shadow that looks great with black kohl.
Palettes often include a beautiful shade of emerald and forest green, the 'Front cover' palette from Boots has a lovely collection of greens, all of which look gorgeous when blended together. The 'W7 'Angel Eyes' palette is also a goody and a great budget alternative.