The danger with templates isn’t what you think it is – sure, your customer may notice that you used the same clip art as a competitor, or you may forget to find & replace another customer name with theirs. Those things are embarrassing, but the real danger is that you don’t have a vision for what you are trying to achieve. With no vision, you cannot create valuable change design, so you fill in a template with as much unique data as you can muster just so you at least appear competent.