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It really depends on what you can program.
I'd suggest making a cool text game with full ANSI or something, maybe a DOOR (MUD) game.
Or how about a SCORCHED EARTH type game?
Program a f1 rally game. I ma making one too whit qbasic (i can not program graphics whit c++, yet)and its not hard. just boxes that you can move, (you "look" it from up).
I think some 1943, or legendary wings type games are great- and not too hard!