I need help coming up with a project idea

I just graduated with a BS in computer science. I have some experience with low level programming but I don't have a complete embedded systems project that's worth putting on my resume. Please help me come up with some ideas. The ideas available online don't seem that interesting to me - one of them that kept coming up was a weather balloon sort of thing that reported data back to some ground station software. While this could be challenging, weather balloons already exist, I don't feel like I'm contributing anything new with this project. What is something I could do that potentially doesn't already exist, or might help a lot of developers out, while showcasing in depth mastery of concepts needed? I want to make a 'complex' project, but I don't want to make a project in which abstractions could be used that save 90% of my time for the same outcome.