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This question already has an answer here:

I'm wondering what algorithm is used to generate the unique address icon that Mist, MEW, Parity and Etherscan use.

Here are some examples:

enter image description here enter image description here

marked as duplicate by Richard Horrocks, Community Aug 20 '17 at 19:29

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  • Wow. I googled "avatar" and "icon" but not "pictures". Thanks! – marceloneil Aug 20 '17 at 19:27
  • No problem. I cheated by remembering I'd seen a similar question in the past :-) – Richard Horrocks Aug 20 '17 at 19:29
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There are many, one popular is Identicon, making use of Identicon.js. If you need something more graphical, you could even use Robohash ;)

They all base on the same principle: Take a hash of whatever, and generate a picture out of it.

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