Badge description (like "You added a co-maintainer to a package. BFF!"):

Contributor birthday celebrations as an active contributor. 1 year, (maybe 2 years), 5 years, 10 years etc.

Based on FAS groups like cla_fedora (there are a few CLAs) and the fact the dates they're approved are tracked along with the ability to track active contributors it should be relatively easy to track how long a contributor has been active and give them "cake" for significant milestones.

Help the badges team understand what this idea is all about. If this badge is awarded for certain kinds of activities:
1) What are those activities?

1, 2, 5, 10, 15 etc years of active contribution

2) Who is doing them (are they packagers? translators? newcomers? veterans? users? sponsors?)

All contributors that have the appropriate CLA(s) signed to be identified as a contributor.

3) Why are they doing them (is this a means to a different end?)

Being an active contributor

4) When do they do them (every day? once a year?)
5) How do they do them (by talking in IRC? by running commands in the console? by using a web interface?)

Actively contributing, like a HR system might email an employee, or send them pucks, on significant milestones in their employment.

Lastly, do you have any ideas for artwork concepts?

Cake! Lots of Cake :-)