Common man you dont want others ideas, just practice writing 10 ideas a day that can solve some problems. Dont filter while writing.

Also word to the wise, if you are asking other people for ideas to implement in a space (ethereum) so that you can learn the technology, implies that you dont know much about the field or have clear basic concepts. For now I would just read/listen/watch to learn the basics in order to unleash my creativity...

your sincerely, nobody...