Once, when I was bored, I made a website. Other times, I added to it:
Truthfully, very few of my for-fun projects are complete. I enjoy tinkering with ideas and new tools, but unless those tools provide some useful function to real human beings, I feel no compunction in leaving a project unfinished. I'm doing my best to unlearn the lesson, "Finish everything on your plate!", and to recognize it as a prime example of the sunk cost fallacy. The purpose of projects undertaken for fun is to have fun. When the fun stops, the project ceases to accomplish its purpose. Therefore, in such circumstances, the rational thing to do is to leave the project for another day. It is one of those rare circumstances in which the is-ought problem can in some sense be resolved.
Finish what you start... when what you started is worth finishing.
I've read some books that I liked and some books that I don't like.