On our 2015 WBPC cruise, there was a Pixie Dust List. It was a more informal version of the many, many formal FEs that were going on. Basically, we added the names of the people from DIS to a list and if you had extra items or wanted to gift only kids, etc. things it was to help you know which rooms they were in. Since it was such a long cruise, it was fun to have FE and he Pixie Dust List.
BUT, pretty much everyone on the PD List gifted everyone. It just did not have "rules"...like many FE exchanges do.
I am not sure if there are ever Pixie Dust Lists where you just add your name and people deliver gifts to you, without some form of reciprocation?