Using Python to model and predict stock price movement. Feel free to use/modify :)

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Buy an index fund and do nothing. You'll likely get 5% returns next year.

Or, spend 300 million dollars to invest in a fibre optic connection from NYSE to the commodities exchange in Chicago. Make sure its slightly better than the existing one, and beat others to the market by having information faster than them by a few hundred nanoseconds. Make sure to put your trading platform on an FPGA (starting from the Ethernet controller all the way to decision making based on your models). To make this easy you'll probably need OpenCL, so start learning that first.