THis is quite impossible feat now, but if you go back to before 2010, you can simply get 17 bitcoin by mining with your own computer rig and just get the mining rewards. The only way is by gambling, either gambling site or some altcoin. Both which are too risky and too hard to double your money. For long term maybe you can start a service that accept bitcoin, just like other business a rough start but if you determined enough you willl earn much more than that.