Here is a list with links to several:
http://www.freequiltpatterns.info/Qu...ltPatterns.htm
You can go to your library and see if they have the book "501 Quilt Block Patterns" by Better Homes and Gardens. I know it has a themed section for teacups/pots.
Also the book "Lap Quilting" by Georgia Bonesteel has a simple pieced coffee cup pattern
There's another here as well:
http://www.blockcentral.com/qb-pattern-mug.shtml