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There are lots of good ideas.
First you have to decide what is the topic which interests you and not what is available.
First pick the topic that interests you: robotics, cars, computer, security, home...
in every part you can add communication, control, dsp, you name it.
do the first step to go to the second.
Let me know if you need help
I suggest you to try to make a ROV /Remote operated Vehicle/ . this is new and unexplored area in the electronics and communications. U know that ROV are used in all missons of NASA in deep space.
I think that will be very inovative to you.
See here: www.homebuiltrovs.com/