Better Gravatar generated icons

Are you bored by Identicons and MonsterId icons in your blog comments? This plugin will add new avatars for users that don’t have a Gravatar image setted, to use this choose the « blank » icon in your « Discussion settings » and use this plugin setting panel to choose your new avatar style. Avatars come from these 3rd party services: Flat Hash (from http://flathash.com/), Robot and monsters Hash (from https://robohash.org/) and Unicorns avatars (from https://unicornify.appspot.com/).