CS

.....project ideas?

Requirements:

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Something useful that can be later sold. Games are allowed but discouraged
Something that shows a lot of OOp implementation
Something hard to program. (I'm the best in class. I need to win the honors)
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I was originally going to do a OCR reader for hard written documents. Upon finishing the first research session I was aware the project had too high a chance of failure and too small a time frame to be completed successfully. I downgraded it to a simple captcha reader but again it was probably bound to fail.
I am now stuck without any ideas.

Can please /prog/ provide some ideas?

(I'm the best in class. I need to win the honors)
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Community college.