What light signals or visual markings indicate that turns should be made to the right at class G airports?
Here's the example from the FAA's Airplane Flying Handbook (chapter 7):


  If there are no other aircraft present, the pilot should check
  traffic indicators on the ground and wind indicators to determine
  which runway and traffic pattern direction to use. [Figure 7-2] Many
  airports have L-shaped traffic pattern indicators displayed with a
  segmented circle adjacent to the runway. The short member of the L
  shows the direction in which the traffic pattern turns are made when
  using the runway parallel to the long member. The pilot should check
  the indicators from a distance or altitude well away from any other
  airplanes that may be flying in the traffic pattern.




Here's what it looks like at Huntsville Executive (KMDQ), which has a right-hand pattern for runway 36: