ok..if you look at the chickens, you take a cupcake, take the paper off and put it on a surface covered with a thin coating of green icing. (you can put them on paper plates, or any disposable plate!)
with a 22 decorating tip, pipe white icing on the body starting from the bottom and working your way up to the top. you have to squeeze the icing onto the cupcake so it will stay on.
then take the same 22 and squeeze in a circular motion on top a ball for the head. Don't forget the wings.. with the 22 also.. just touch the side of the body and squeeze pulling it to the side and make a little wing, and behind it you can make tails just stick the tip in the back and make some little points.. rooster I start on the bottom behind him and pull a long piping of the white to get a few long "feathers"
then with a 4 tip, and red icing make the cheeks, and the comb on the top. the rooster gets the waddles under where the beak will go.
then with yellow, and a 4 tip, squeeze feet out starting from the body and making 3 lines for the toes. and between the red cheeks squeeze a beak. with black icing, (I use chocolate buttercream icing mixed with superblack gel) give them eyeballs.
I usually use the grass tip and make grass also. you can use the grass tip and yellow to make a nest between them, and squeeze a white egg in there with a 12 tip.
I hope this helps. It is hard to take alot of pictures of step by step at work, I usually just have my camera phone in my pocket!!!
Have fun!