If you're looking to make a solid investment,Bloombergis reporting that Legos could return more on your investment than large stocks, bonds or gold.
According to the study, conducted by Victoria Dobrynskaya of Russia's National Research University Higher School of Economics, Lego sets carrying Harry Potter or Star Wars themes yielded an average 11 percent return.
Small and large sets are the most likely to increase in value. However, not every Lego set will make money for you. The study found that The Simpsons sets consistently fail to turn a profit for their owners.