You are going to hear this anytime this question is asked. A: "Build Something!" Reading books and following tutorials are all well and good, but you are not going to fully understand what it takes to be a professional developers until you start creating full applications. Don't worry about the design, or perfect architecture, just come up with a small idea and build it.
I don't have any ideas and anything I see when I search for ideas just seems silly.
You can also try cloning sites you like, such as Twitter, Facebook, Hacker News. Or maybe a text-mode game. Anything that you might think is cool.
Or a tool for reading from some API you like. What about a command-line tool for getting the weather report based on your IP?