Boltstarter: BoltStarter - Launch Your Next Project with Pre-made Templates
(check github repo: Message #773 by hlsitech1 – #General)
Izzet Aslan: İzzet Alşan - 3D Modelleme, Animasyon ve Oyun Geliştiricisi (Poly AI example)
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But this is for boltnew and not for bolt.diy 
Bolt.diy also has starter templates here on the startpage:
And you can use any project as starter template by appending the gitrepo url to the bolt url:
http://localhost:5173/git?url=https://github.com/YZarytskyi/react-voice-visualizer.git)
created this chrome extension link using bolt.diy
