Cool evenings around a fire? All of your friends will say 'count us in'--dress up the area with a wide array of plants in window boxes that help define the space, in addition to low laying landscape beds with lots of perennial color.
It seems as though I am using a lot of celebrities and that is because I feel as though they are all defining the term cool well enough for me. Now Selena Gomez always had a "basic" style, nothing too crazy. But now she is changing and that is COOL, she is testing out the waters to see what style really defines her and I truly admire that. We never know what type of style we exactly are until the time comes that we finally are happy with our look.