Alam Maya, where everyone floats around. This piece of art was created by using only one tool, Gradient Tool. It was as easy as ABC, just set the mode to difference and use an Black to White Gradient and pull wherever you like it. And the stars effect, just change to diamond and use normal mode. See.
Tips: Not only gradient tool have blending option brush, fill, clone stamp, etc too have this function, so try around. Remember to brand your art.