Alternate icon for Bookends app?

[chas]

Until a recent update, I was happily using a darker version of the Bookends icon in my macOS dock. Since the last update (to 15.1.2), the app icon has reverted to what I believe is the standard icon with a lighter background.

Where can I find the darker version? The standard icon closely resembles a couple of other app icons I use, and it causes me a world of trouble (not really) to have to search so hard for Bookends when I need it in a hurry.

Thanks!

[chas]

OK, I think I found what I need at this site. It's listed as an iOS icon, but it works fine on macOS.