Every one of your clients wants to (or at least should want to) stand out from their competition. To be distinguished is to be memorable. Your client’s job is to provide a solid business. Your job as a web designer is to make sure that they get both noticed in the first place and remembered so that they have an audience to whom they can demonstrate their excellence.
Creating a standout website design is not exactly the easiest task. It is much easier to pick a common layout and fill in the blanks or to pick a design trend and build a website around it. Neither of these methods will help you create a website that breaks the mold, though.