You have some flexibility when designing your layout for mugs. Although the default crop box in the cart is vertical, if you select "cropping: None", we'll do our best to fit the image around the mug if it's a landscape-oriented image.
Currently the lab cannot wrap handle-to-handle, but they pretty close on the 15oz white mug if you use an image with a 3.5x8.5 aspect ratio. For an 11oz white mug, one side of the image will still be a few inches away from the handle, but your best bet is a 3x7 aspect ratio. Ditto with the 11oz black mug, though this same aspect ratio ends up wrapping somewhat further around the mug than in the 11 oz white mug.
An example of a 3x7 aspect ratio image: 1500px tall by 3500 px wide.
FORGIVE OUR LAG, PLEASE:
The following images use the olde dimensions, but still illustrate the layout of the mugs nicely. Until we remake these images, please see above specs for full wrap dimensions.
You can use the "full wraparound" - like this: 
Another example here, showing how the main part of the image can be positioned on different sides of the mug: 
Here, the entire photo will print:

Want the photo on the OUTSIDE of the mug, as you are holding it in your right hand? No problem: 
Other things you can do:
I just took a crop from an image, and put it on a canvas that was the proper size, then added the text in photoshop.

Dear purchasing Manager,
Have a nice day!
Here is Hala from Songxing ceramic co.LTD. We are pleased to know that you are presently on the market for Ceramic, procelain and ceramics cartoon cup,seasoning bottle,jewel box,ashtray etc.and as a specialized design,manufacturer and exporter for this product in China for some years.
If you have any inquire about our products,please contact me. Hope we could have chance to cooperate with you!
Best regards,
Hala Lin
FuJian Quanzhou Songxing ceramic co.,Ltd.
Factory Add:Industry Area Sukeng Quanzhou Fujian
E-mail:wangxialan888@126.com
MSN:halalin2009@hotmail.com
SKYPE:halalin
I'm trying to make a coffee mug. I did it before but now do not find where to do it.