folderify
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Create a tiny icon to match the icons in the sidebar
This is awesome, I used it to create a nice "Repositories" icon for my Mac. I do have one small request: Would it be possible to add an option to create a tiny icon in the style of the Downloads icon as well? I'd really like a little Git logo in my Favorites rather than a dumb folder

Do you know how to set an icon that will be used in the sidebar? I think I once looked into it, but I didn't get very far.
After a little research, it appears that this is not a metadata/resource fork property of the folder, but specified by applications by creating Finder Sync Extensions.
Should be possible, but it looks like it'll take a whole bunch of grunt work.
Ah, so more difficult than just generating an icon. That's disappointing. Thanks for the info!
I'm sure we could still do it. ;-)
One possible approach: https://www.reddit.com/r/mac/comments/seig87/how_to_make_custom_finder_sidebar_icons_big_sur/
I want this so much ! Maybe this could be useful: https://github.com/nullobsi/SidebarICNS ?
For what it's worth, I've wanted this for a long time as well and I have found this project: https://github.com/rknightuk/custom-finder-sidebar-icons It automates the renaming process mentioned in the readme of the SidebarICNS project and also implements the guide from the Reddit post.