I've seen a few people make substance designer generators that took an image and made it look painterly, so I wanted to try to make a painting from scratch. This was the first set and definitely a simpler mix of patterns, but I'm working up to more complex painting styles.
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You can get the Unreal pack here: https://www.unrealengine.com/marketplace/en-US/product/digital-art-and-gallery
And the Unity set here: https://assetstore.unity.com/packages/3d/props/interior/digital-art-and-gallery-174989
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You can find the substance on Gumroad here: https://dctech.gumroad.com
Or on ArtStation: https://www.artstation.com/undertow/store