A website is cool because of it's content, not because it simply exists. What interests do you have that you could base your website around? Do you like creative writing? Photography? Politics? You have to know what you want (and it has to be what you like) before you can have a "cool" website.
Give us something to go off of, and we'll try to help out.
The importance of purple polka dots. How purple polka dots affect various aspects of our lives. How small can a purple polka dot be and still be a purple polka dot. Conversely, how large can a purple polka dot be and still be a purple polka dot.
The purple polka dot options are endless.