When you overlay the het ghost X het ghost results with the 50% chance pastel the breakdown of the odds for each egg ends up like this:

1/8 ghost pastel
1/8 ghost
1/4 pastel het ghost
1/4 het ghost
1/8 pastel
1/8 normal

Of course as elevatethis pointed out the non-ghosts are 66% chance het ghosts since you can't tell which are which however it's nice to know you only have the 1/8 chance of any given egg being a complete normal.