Check out graphicburger.com mock ups.
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Sent from my SM-G965U using Tapatalk
You could upload an animated gif that cycles through the colour range at whatever speed you set in the gif.Right now, I do it the brute force method of taking blank product images from our suppliers and placing whatever graphic it needs in photoshop. Then I have to upload a separate image for each color. There are templates built into some e-commerce platforms, and apps I'm sure, that allow you to upload one product image and it generates all the colors for you. We're going to be trying out deconetwork, which has this feature, though I'm not sure yet how graphics/decorations factor into it