You’re right. I believe that’s more of an issue with light backgrounds and surroundings like yours. I use the dark theme, so the square almost disappears and the obsidian piece stands out a bit more.
I’ll work on some alternatives and update this post. Thanks.
Yeah, I guess there was an update to the site, and it must have been automatically removed or something. Anyway, you can you take the PNG on the original post and create the .icns using one of several online converters.
As an alternative means of installation that worked for me, you can also change the .png extension to .icns and replace the “Obsidian.icns” in the Obsidian “contents”:
Download .png file and rename to “Obsidian.icns” (Select yes, when it asks you whether you want to change the extension).
Took the liberty to make my own Calibre icon. Tried to stay as close to “the original vibe” while making it sit nicely in the Mac OS doc. The background might be a bit too dark-ish.
Calibre itself has some quirks. As you know.
Next to changing the .icns in Resources, you’d have to exchange the icons also in “Show Package Contents” → “Resources” → “Resources” (Yes, again) → “Images” and replace the images there too. The named image files are in the zip below. Drag 'n Drop and done.