This research is done for an app (soon to be launched), a tool to help and remind us to stay in touch with important people in our life.
The app manages lists of contacts, and needed a placeholder, generated graphic, different and ideally recognizable for each contact.
The internal pattern is generated starting from the contact's first name and last name. No randomicity leveraged, so if you remove a contact and then add it again you'll have the same graphic re-generated.
The different colors convey the idea of proximity. You have different "circles" in which you place your contact, and the closer you place a contact, the more often the app suggest you to connect and get in touch with him/her