UPDATE: With Snapchat 2.0 comes a number of changes including more places in which we are seeing the Snapchat white ghosts. Users are seeing them beside their friends, on the Added Me screen and Add Friends from an address book in the phone.
At this point, we are unaware of a way to change this white ghost. You can take a selfie for your Snapchat ghosts but you cannot manually select a different type of white ghost to show up when your friends see it on their list.
When someone you do not know adds you on Snapchat you will either see a Selfie Ghost or a white ghost with a funny face. The white ghosts look like this:
I believe these are all the ghosts that show up when someone new adds you. Note that the black one is often a selfie ghost. At this point, I do not know how you can see another user’s selfie ghost if they are already your friend. The only trick is to remove them as a friend and if they have added you you will see them on the added friends list.
I have no idea why a specific white ghost shows up for any given user. If anyone knows why please feel free to comment below. I get over 100 new Snapchat followers every single day and I have not been able to come up with a reason as to why one user has a smilie white ghost and another has a sad face or crying face.
I would love to know more as to why certain white ghosts pop up on Snapchat. If you have any information do not hesitate to comment below.