How to list all products with the same attribute?

[yisou]

Our products have different colors: red, green, brown, black, and yellow.
How to list all products with the same color? Say how to let customers see all products with red color.
We have 3 categories: women, men, and kids. All have products under these 3 categories have different colors.

tks.

[kobra]

All have products under these 3 categories have different colors.

How are these colors entered??
By attributes to each product
Or by a separate product for each color?

A link to what you have will take the guessing out of the mix

[yisou]

i add the attribute value to each product. i need to list all products with the same color attribute value, just like a main category does.