I designed these four icons for the same theme: website of the Perfume Company, for which I also designed logo and topography.
As I mentioned in Topography, this company uses maple leaves to represent their idea of nature in order to persuade customers to buy their products. So the green icon comes. When our users click this button, their will see the images of our advance laboratories and also the lists of ingredients of all perfumes.
There is a shopping cart image in the blue icon, so it is obvious that it designed for checking out.
The purple icon represents the vip customers. VIP can receive their special service and gift from there.
The pink icon will show customers all the gift set and discount.
The reason why I choose these four colors is that they are very cute and appealing to girls and women.