sass-map-each-loop.scss

$icons: (
  camera: 'factsheet_bg.png',
  ebook: 'library_bg.png',
  newsletter: 'newsletter_bg.png',
  pages: 'project_results_bg.png',
  publications: 'publications_bg.png',
  youtube: 'youtube_bg.png',
);

@each $class, $filename in $icons {
  li.icon-#{$class} {
    background: url('../images/#{$filename}') no-repeat 0 50% !important;
  }
}