Contact Identicons is described as 'Replace your missing contact photos with stylish identicons that uniquely identify all of your friends' and is an app in the Office & Productivity category. There are five alternatives to Contact Identicons for Online / Web-based, Android and Android Tablet. The best alternative is Gravatar, which is free. Other great apps like Contact Identicons are Robohash (Free), Identiconizer! (Free, Open Source), Evatar (Free) and Identicon (Free).
Robohash is a easy web service that makes it easy to provide unique robot/alien/monster/whatever images for any text. Put in any text (such as IP address, email, filename, userid or whatever else you like) and get back a pretty image for your site.
This is a port of ChameleonOS' contact identicons feature with some additional features and fixes. When enabled, new contacts will be assigned a unique identicon instead of the default picture. Features:
Evatar stands for email-linked avatar. Your evatar is an identifying picture that can be used to represent you on any website. Developers can use Evatar to seamlessly integrate user pictures that are effortlessly customizable.