I'm currently on day 252 of a streak: https://github.com/waywardmonkeys/
Most days are pretty easy. Being that I maintain a large project (Open Dylan), there is almost always a simple bug to fix, documentation to improve, typos to correct, bugs to file, pull requests to merge from others.
It has been great for keeping things moving and making sure that every day, I make at least a little bit of progress. Every day, at least a tiny step forward.