Green tea in Custom coffee mugs?

You can create custom mugs on a printing store these days. They are a fresh breath of air as compared to your regular store bought mugs. When we buy coffee mugs from our local market stores, we do not have the liberty of changing the designs of these mugs. We have to purchase what we are able to find on the shelves of a store. But what if it was possible to choose designs of our liking and even customize these cups with any sort of design?