Nuttermit

Hello. So I'm trying to make some Who Wants To Be a Millionaire-ish background, but I don't know how do I make this "smoke thing". The effect I want to achieve is selected as these tiny, little dots. Here's the version without them: Thanks in advance.

Hello guys, I'm a newbie, and I want to ask you a question. Is there a way to "lowpolyfy" images? Just like this: Thanks.