This feeling can be based either on the logo, layout, color scheme, type of artwork, or all of these combined. Keep your eyes open to graphical elements that surround you everywhere you go. Get inspiration and ideas from what you see. Working without a designer. This can be done with text treatments alone.
Most computers come standard with a font that consists of graphical images as apposed to letters.
The most common would be wingdings or something of that nature. If you use any of these symbols make sure you don't make your materials too busy. I'd suggest picking only one symbol if you decide to use any at all. They can be used at the beginnings of your paragraphs, or around your heading. Again, don't let your materials start to look too busy.