Trade them for bitcoin and buy yourself a car from any of several reputable dealers. Alternatively, you will be able to gamble them away on our blackjack site once it's finished. Beyond that, I think it's just a matter of time before snoop-dog only accepts blackcoin for his new albums/tracks.
I didn't know that I can buy a car with only 28796 Blackcoins. I guess I should have mined more in retrospect. So i have to exchange them for something else (BTC, etc..) in order to buy something is that correct? And by the way I am sure that Snoop-lion will likely take Potcoin instead of Blackcoin. Accepting Blackcoin and not Whitecoin would be borderline racist.