DefaultAvatarOption
The default avatar image to use when the user does not have a Gravatar image.
Inheritors
Types
If you prefer to use your own default image (perhaps your logo, a funny face, whatever), then you can easily do so by using the CustomUrl option and supplying the URL to an image.
Identicon: a geometric pattern based on an email hash
Monster: a generated "monster" with different colors, faces, etc
Mystery Person: simple, cartoon-style silhouetted outline of a person (does not vary by email)
Retro: awesome generated, 8-bit arcade-style pixelated faces
Robohash: a generated robot with different colors, faces, etc
404: Fallback to a 404 error instead of returning a default image. This allows to detect if the user doesn't have a Gravatar image
Blank: a transparent PNG image
Wavatar: generated faces with differing features and backgrounds