A single large image that wraps almost entirely around the mug, leaving a small gap near the handle.
Standard ceramic mugs are the most popular, but there are several specialized options to consider:
Close-ups of people or pets often "pop" better on a small curved surface than wide horizontal group shots, which can distort at the edges.
Aim for a resolution of at least 300 ppi at the actual print size. A minimum resolution of 1050x2400 pixels is often recommended for full wraps.