What can I do with my old phone other than sell it?

Just got a new phone a few days ago and my old cracked android is just laying around. I know I could sell it or recycle it, but with such an impressive piece of technology I want to keep it in use so long as I have it. The phone has no service. I looked online a bit, but none of the options were appealing. Are there any suggestions that people could give me of useful or productive uses of this old phone that aren’t the basic ‘use it as a security camera’ or whatever.