Yup, do it the tried-and-true way already hit repeatedly in this thread (spend significantly less than you earn, invest, then wait).
I also think it's okay to "gamble" a little discretionary income as a chance to hit it big, if that's your thing. But this should only be after meeting your regular investing goals. For example, if you're already saving/investing 50% of your income according to your own goal, and you have a few hundred dollars of discretionary income to play with each month, you could consider investing it in a high-risk investment that has the potential for a big payoff. You should only do this if you know there's a good chance you'll lose it all and are okay with that, and if you're investing it in a somewhat intelligent way (such as in an individual stock you have researched, or a business venture on the side -- not holding money in your bank account for an alleged Nigerian prince or acting on some "hot tip" you received from a coworker).
I did this literally by gambling in casino blackjack. I didn't hit it big, but using intelligent blackjack methods netted me an extra $30,000 over the years while providing lots of fun, perks, and free trips at the same time.
I also agree with Arebelspy that real estate is an excellent way to really accelerate gains if you're suited to it. Leverage is amazing.