why not make a top down space shooter? One of the simplest kind of games to make (without making a board game) much more fun than a board game, might go over the 1000 lines
i am sorry i didnt share the level of C++ knowledge i not this level I am zero with graphics at this time :( but soon will be.
A text based game would be very nice :)
If you use something like SFML, it shouldn't be too much more difficult than text based. Ultimately, it might even be easier to manage. You will however, require some basic knowledge of C++ class notation.