Lying on the ground can be left or right

code/modules/mob/living/carbon/human/update_icons.dm

@@ -136,7 +136,11 @@ var/global/list/damage_icon_parts = list() //see UpdateDamageIcon()
 		anim_time = 1 //Thud
 
 	if(lying && !species.prone_icon) //Only rotate them if we're not drawing a specific icon for being prone.
-		M.Turn(90)
+		var/randn = rand(1, 2)
+		if(randn <= 1) // randomly choose a rotation
+			M.Turn(-90)
+		else
+			M.Turn(90)
 		M.Scale(desired_scale_x, desired_scale_y)
 		M.Translate(1,-6)
 		layer = MOB_LAYER -0.01 // Fix for a byond bug where turf entry order no longer matters