The Simple Input Tabs plugin gives you tabbed editor panels for separate editing of different blocks of content. Here each of the four columns is put in a diferent tab. Change the icon in source mode.
Font Awesome gives you scalable vector icons like those used here that can instantly be customized — size, color, drop shadow, and anything that can be done with the power of CSS.
I upgraded the Font Awsome Icons to the latest 4.2.0 with the new icons and new css file. You can use these icons nywhere you want in the site. Here they have a circular css border.
GetSimple's CKEditor automatically tidies html and removes empty tags. If you use the Font awesome syntax of empty <i></i> tags the the CKEditor needs to be configured to not remove them. See the support thread at get-simple.info.