Circle shape

hi could somebody please tell me how to knit a circle on a jumper ,i cant figure it out on graph paper do i do odd and even stiches or jst odd stitches or jst even stitches its about an inch or 2 bigger than a c.d. (its for a christmas pudding so if anyone has a christmas pudding pattern then that would be even better.
thanks
Pat

Do you want to make a textured circle by changing knits to purls? Or do you want to change the color?

http://www.microrevolt.org/knitPro/index.php

This site is a good place to make a graph.