Rules for mug design:
- Find a great idea, slogan or saying that caters to a niche
- Make an AWESOME JAWDROPPING design
All mugs must follow AT LEAST 1 of the 2 rules.
Here is a design that follows rule 2:

and here is a design that follows both rules:

When you design you can use either white or black mug:

Or you can use a two-toned mug:

Now go through Better Mousetrap, Sorting Social and The Aplhabet Soup to learn what to put on the mug.
When you are ready for some designing, use the MUG design SOP.