The contact lists in Android normally auto populate with the images of your friends from their social media accounts, but when your friends have not synced their phone number with their social accounts you get an ugly generic contact image. This is normally a grey silhouette. This does nothing to help you identify the person. You have to resort to the old fashioned method of actually looking at there name in text to find them in the list. A feature of ChameleonOS replaces the generic grey head with an identiconizer which is an image of geometrical shapes and colors. This feature has been turned into an app by developer "GermainZ". Identiconizers give you a whole new way to distinguish your contacts within your contact list. With the app you are able to change the style, size, shape, and color of the identicon. Head to the link below to download this app.
Via XDA