There are so many different shapes of mugs. If you are just now learning to throw mugs or want to try different forms, here are some tips.....
* weigh your clay ( the average mug takes about one pound of clay)
* think about what will be put in the mug ( hot beverages need a less open rim in order to keep things warm)
* think about how you will glaze it ( the foot ring needs to "catch" or trap glaze)
* think about the rim and how it will feel on the lips ( it should be thinned and slightly angled outward)
* think about handle attachment ( the most common mistake is making the handle too big and out of proportion)
* get out of the rut and try new forms
( this is my typical mug form....the rim is "squared " , the foot ring flares up to catch glaze and is altered with my thumb on both sides , I trace around both points of attachments of the handle with a rubber tipped tool...this prevents cracking and gives glaze a place to pool)