if you want to double it quickly go to the nearest casino and put down a $1000 bet on red at the first roulette table you see
If you want some longterm income I suggest that you come up with a simple yet brilliant/clever/novel/unique idea, source it to freelancer, get it made, then monetize, promote, and get paid.
Ideas could be....idk stuff to do with bitcoin, humor/novelty like thefuckingweather . com and vuvuzela . fm, or maybe even a simple ipod app....
You could also go big and invest in a system of microniche sites, autoblogs, content lock sites, and or micro amazon affiliate sites