Last October I decided to participate in the popular month long challenge, Inktober (in combo with 31 Witches). It wasn't something I'd ever done, but it went pretty well...for about a week. Then I skipped a day, caught up in my own misery and I stopped working at them until October was already over. Usually I don't have any issues with dropping something I don't necessarily have any obligation towards, but this one wouldn't leave me alone.
It took me until mid January before I finished, but it was a huge accomplishment for me, especially with my track record with personal projects. This was something I am incredibly proud to share.