The phrase "a cool combination of" is correct and usable in written English.
It can be used to describe a blend of different elements that are appealing or interesting together.
Example: "The new restaurant offers a cool combination of Italian and Japanese cuisine that has attracted many food enthusiasts."
Alternatives: "an interesting mix of" or "a great blend of".
The steak (my favorite) — marinated in Coca-Cola and seasoned with oregano, vinegar, achiote and pasilla chiles — is mild, as is the vegetable filling, a cool combination of guacamole, refried beans and Mexican cheese.
I bring a cool combination of beats you can dance to, attached to a story people can relate to...something that's not around as much anymore.
Every day, before going to work, he would ask his daughter to pick up a cool combination of clothes for him to wear; so he doesn't feel old!
However, he found the scene in which an image is found in the static of a video recording to have been a highlight, calling it "a cool combination of hard science and the inexplicable".
Among young Parisians, there is currently no greater praise for cuisine than "très Brooklyn," a term that signifies a particularly cool combination of informality, creativity and quality.
Even after a quick visit, you might echo the young Parisians who have become fans of the American-inspired gourmet-food trucks in Paris: "Très Brooklyn," they say — a term "that signifies a particularly cool combination of informality, creativity and quality," The New York Times reported recently.
Close your eyes, and Todd Barry sounds like an impossibly cool combination of Jack Nicholson in his prime and a smug jazz D.J. after a few bong hits.
Edible flowers mingled with a colorful melon salad and icy cucumber granita, a cool combination balanced by the heat from slices of jalapeño.
Double Sextet uses Grammy-winning ensemble eighth blackbird's cool combination of flute, clarinet, vibraphone, piano, violin and cello doubles.
I will say that I saw some really cool combinations of various web services (maps, search, Answers, flickr, music, del.icio.us, etc).
The coffee culture here is a before-it-was-cool combination of deep tradition and Italian influence during its brief occupation in the 1930s.
