Anyways back to the topic, just like pink is for our face, purple is apparently the color of the moment for our eyes. (Excuse my lack of knowledge for the names of the different shades and hues of purple.) As seen on the SS06 catwalk:
Twinkle -This is such a pretty purple! This light, shimmery purple is perfect for both day and night.
Badgley Mischka -This is a solid, greyish purple color. Another good day or night color if you prefer to not look so sparkly and more 'proper' and sophisticated.
Missoni -Another solid purple. The pink blush on the models make the whole look 'prettier' than the look in Badgley Mischka.
Libertine -Very strong, shimmery purple. This is serious hardcore purple, so only wear it for parties at night!
The Chanel and Dior eye shadow palettes are both great for the looks above. I prefer the Dior one simply because there are five shades to mix and play with, but Chanel eye shadow is simply too divine to resist!
I'm also loving the Nars SS06 campaign. The purple (and the whole combination of makeup) used here makes Lily Cole look so haunting! 
The Nars duo eye shadow gives a more matte effect than the Chanel and Dior palettes, so you may prefer this palette if you don't like shimmery eye shadow.Purple is especially compliments brown and blue eyes, but it goes for all eye colors so do try it out!