The organizers of the most popular European Fantasy League, the Spanish SuperManager, have set up an Olympic Games fantasy league, too. So if you want to build your own Olympic Dream Team, just go ahead.
Despite being only available in Spanish, I managed to create my own team and compete against the currently already registered 75,000 teams. So if you want to try yourself to beat me, just register yourself here.
There is also a BallinEurope Private League which you can join. The password for it is ballineurope. So here is the composition of my Olympic Dream Team roster:
Guards: Zoran Planinic, Ricky Rubio, Patrick Mills
Forwards: Ramunas Siskauskas, LeBron James, Carlos Jimenez, Linas Kleiza
Centers: Dirk Nowitzki, Marc Gasol, Sofoklis Schortsianitis, David Andersen
Good luck to all the participants, I will keep you updated about my progress.