I would definitely like to work on something that can provide me some passive income later. I don't have any good idea for that. If not that I may work on some

I would definitely like to work on something that can provide me some passive income later. I don't have any good idea for that. If not that I may work on some design projects of other startups to sharpen my skills or may be some Wordpress themes. Interested in knowing what cool ideas other people have.