TeePublic
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TeePublic started in 2012 as an artist marketplace and remains design-focused. While it's best known for printed apparel, it also lets independent artists sell their work on custom mugs. This means you're buying designs from creators rather than uploading your own photos.
It suits design lovers and collectors hunting for unique, artist-made mug designs. If you want original artwork rather than personal photos on your drinkware, this is the place.