The Inktober Initiative was created by artist and illustrator Jake Parker in 2009 and became a massive worldwide art event, much like NaNoWriMo is for writers. I joined in the last 2 years; my first year was a huge failure but this year I managed to get some fun work out despite other project demands.
In fact it got me into the habit of regularly drawing something for myself along with my commissioned work. Inktober is lots of fun and I love being part of the community; I'm definitely doing it again next year!