marble textured background, monochromatic

marble-background.css

.thing-with-background {
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' width='100%' height='100%' data-ember-extension='1'%3E
    %3Cfilter xmlns='http://www.w3.org/2000/svg' id='mono-chrome-turbulence'%3E
      %3CfeTurbulence xmlns='http://www.w3.org/2000/svg' baseFrequency='.2' numOctaves='1'/%3E
      %3CfeColorMatrix xmlns='http://www.w3.org/2000/svg' type='luminanceToAlpha'/%3E
      %3CfeComponentTransfer xmlns='http://www.w3.org/2000/svg'%3E
          %3CfeFuncA type='linear' slope='0.2'/%3E
      %3C/feComponentTransfer%3E
    %3C/filter%3E
    %3Crect x='0' y='0' height='100%' width='100%' fill='#263f4a'/%3E
    %3Crect x='0' y='0' height='100%' width='100%' filter='url(#mono-chrome-turbulence)'/%3E
  %3C/svg%3E");
}