oh.. i got some question

oh.. i got some question again..... /____\

 I want the brush which around the people @@
i mean the white line @0@

 how can i get this effect @@?
i mean to make the icon looks dark

the last question is ...
 can anyone tell me how can i make a circle like this?
is it the texture or brush ? who got it @_@?

THANK YOU VERY MUCH ^_______^