highlight-changes-face-list

highlight-changes-face-list is a variable defined in `hilit-chg.el'.
Its value is

nil

Documentation:
A list of faces used when rotating changes.
Normally the variable is initialized to nil and the list is created from
`highlight-changes-colors' when needed. However, you can set this variable
to any list of faces. You will have to do this if you want faces which
don't just differ from the `highlight-changes' face by the foreground color.
Otherwise, this list will be constructed when needed from
`highlight-changes-colors'.

You can customize this variable.