Get better at some aspects of creating software by doing them more regularly.
A friend of mine, as a way to "level-up" her young daughter at violin, set a goal that the child would practice every single day for 100 days, without a break. This seems like such a good idea that I decided to steal it.
Update: I changed the rules to allow issue activity as well.
Update: I changed the penalty for missing days.
Every day, for 100 days in a row, create a new event somewhere on GitHub. It can be of any size, on any project and can include commits or updates to issues. If you miss one day, lose two points. If you miss a second consecutive day, lose four additional points. Double the penalty for each consecutive day: four consecutive days would total 30 points lost - 2 + 4 + 8 + 16. Your score cannot go below zero.
Note that commits include changes to a wiki. It's not cheating because GitHub wikis are themselves git repos. Including wiki work gives you a way to have days where the work you did was primarily thinking, not typing, but it still makes you write down at least some of what you thought about.
My scorecard is at https://gist.github.com/1377911.