Destiny Ghost Shells?

Anyone know how to get different shells for your ghost other than the one from a preorder?

Looking for this aswell.

Also does anybody know what Grimoire cards are for?

In order to unlock Dead Ghosts you will need to find them scattered across the different planets of Destiny.

Source also read more here.

dead ghosts dont give you a new shell to use

It was to help “iLuke” out with what “Grimoire Cards” are used for.