Yes, layout is important. And yes, reusability is important. Of course, color choices are important. The truth is, responsive design techniques are also important.
But here's the deal, sometimes, every once in a while, and maybe more often you need to, play with fonts and colors and patterns and subtle gradient shadows. You will usually spend more time on it than you should. But you get a lot in return. You learn skills and techniques. You broaden you design experience. You get a break from the have-tos and musts. And you get an image you can share.
Often great design work comes from taking the chance to start something without knowing how it's going to finish. Make your life more fulfilling, start something today!