A sandstorm whips across your area, blasting the dirt and grime from your desk, as well as a quarter inch of the deck material, your house, and anything else aboveground. That includes your friends and neighbors, which raises a mixed mist of sand and blood at the end of the storm, which settles onto your nicely blasted fence, leaving a lovely coat of blood as paint.
Also, I now have to write that up as lyrics for a metal band.