Creating a HalfTone Effect in Illustrator

1. used the shape of a circle. If you want it around a specific shape you must copy the outline of that shape and repeat the same then increase the size of the same shape, with reversal of colors you can get different effect
2. then a second circle
3. center align the two
4. go to object >blend>options

5.object >blend> make
6. effects >pixelate>color halftone

7. play w/ choices, then ok
8. then go to object >expand appearance then live trace>photo high fidelity
9. expand

http://www.webdesign.org/web/vector-graphics/adobe-illustrator/creating-a-halftone-effect-in-illustrator.15445.html