To get Ecto-tokens you need to worship Ectofuntus.
Fill your inventory with nine buckets, nine pots, and nine bones.
You also must be wearing a Ghost Speak Amulet to get Ecto Tokens.
Head to the Ectofuntus (use your world map if you are having trouble finding it), it's located just north of Port Phasmatys.
Once you are there, follow these quick steps:

1. First head to the east side of the room and climb the stairs.
   You will find a loader there that you can use your bones on.
   Do this and then right click on the grinder and select "wind bone grinder.
   " Right click on the bin next to the grinder and select "empty bin.
   " One of your pots will fill up with bone meal.
   Repeat this for all nine pots.
   
2. Head back down the stairs and go down the trapdoor at the west side of the room.
   
3. This room has several floors, but all you have to do is walk around the room to get to the next staircase.
   Head down to the bottom where you will find a pool of slime.
   Use your bucket on this nine times.
   
4. Head back to the main floor and right click on the Ectofuntus in the middle of the room.
   Select worship and one bucket of slime along with one pot of bone meal will be emptied.
   
5. Worship the Ectofuntus nine times and retrieve your Ecto-token from the Ghost disciple standing in the room.
   You get five Ecto-tokens for each worship, so that adds up to a total of 45 tokens! Once again, make sure you are wearing your Ghost Speak Amulet or this step will not work.
   

What are Ecto-tokens used for? Ecto-tokens are most famous for being needed in the Ghosts Ahoy quest, although they are needed for all the following quests:

• Ghosts Ahoy requires 31 or more Ecto-tokens to complete.
  
• Animal Magnetism requires 20 tokens to complete.
  
• Creature of Frankenstrain requires two tokens to complete.
  However, it does not require any if Ghosts Ahoy has already been completed.
  
• Making History requires two tokens to complete, but once again not needed if Ghosts Ahoy is already finished.
  
• Rocking Out requires 25 tokens to complete.
  
• You can buy a trip to Dragontooth Island for 25 Ecto-tokens.
  
• After Animal Magnetism, you can buy and Undead Chicken for 10 tokens.
  
• Last, you can pay five Ecto-tokens for ale-yeast.
  This is a complete rip off considering the Grand Exchange price for ale-yeast is 30 coins.
  

Alright! Now you know how to get Ecto-tokens and what they are used for.
Have fun!