k9mail/k-9 — pull request #344 by sfuhrm (2013-07-21 15:31:34+00:00)
Title: GMail-app-style generated colorful one-letter contact pictures for pictureless contacts

K9-mail shows contact pictures in front of mails.

### Before

K9-mail showed an android dummy contact for unknown contacts.

### After

K9-mail shows a capital letter with a unique color where the letter and color are calculated out of the email address. This feature is comparable to gmail.