Effects Editor, Peacock save them as blackboxes and then directly import them into Aviary's image editor, Phoenix. What this means is now you can have an UNLIMITED amount of image filters and effects can be used since they are user generated.
When you are in Phoenix and click the Filters Dropdown you will notice the option to Import Custom Filters
These filters were created by the Aviary community using Aviary's effects editor, Peacock.
Choosing an effect from the blackbox library
Once the effect is selected you are given the option to tweak the effect:
The applied effect looks like this:
And the final product
To learn more about Peacock's Blackboxes you can check out the userwiki for documentation]]