squilter

I don't know if this is what you would want, but it is an awesome way to do them.

http://www.hgtv.com/video/easy-circl...deo/index.html

fabric lover

I found this tip:
http://stitchriprepeat.blogspot.com/...blog-post.html

MadQuilter

I use this method but it is not appliqued.
http://www.quiltingboard.com/t-90945-1.htm

Check the tutorial section using the keyword "circle" in the search function and select the Tutorial section in the advanced options. Tons of info,