Yep! There’s two popular flavours: onchain via solidity (code that draws the token on the fly in tokenUri, usually SVG) or onchain by storing some code in state and having a client render it (Artblocks, Deafbeef)

The latter allows you to be more expressive w/o worrying about EVM gas. But for the tokens to appear properly on OpenSea and listing sites, you need metadata that points to a PNG file or HTML file, usually that means a rendering system that generates thumbs and and saves them on a url or ipfs link

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