I also struggle with the idea process. One place to get ideas can be the laracast series themselves. One that has helped me is thinking of something that I am looking for.
Case in point, I have found resources for a particular field lacking for new comers. Create a resource site for it, that's one I am working on. It doesn't have to be perfect, and treat it as a learning experience. I spend more time looking up how to do things than I do coding.
If you want more details on some of the applications I'm working on and maybe some ideas, feel free to contact me.
Here is a good starting point:
https://www.google.com/search?q=ideas+for+begining+web+developers