Another idea is open source robotics. I have a lot of experience with this at this point and would love to share. 

One more idea would be talking about making and using custom Java JNI. have a library that's awesome but hate writing applications in C? JNI is a way of exposing these libs to Java. As an example I wrapped a v4l2 frame grabber and was able to get framerates 2-4 TIMES faster then OpenCV's frame grabber. Getting started with JNI is full of "gotchas" that keeps most developers away, which I think is a shame. 

~Kevin Harrington
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