How can I change icons of bookmarks on sidebar ?

  1. Nautilus bookmark icons in sidebar are symbolic icons.

  2. Nautilus currently sets the default symbolic folder icon from the current icon theme (folder-symbolic) for any non XDG dirs (special dirs like Music, Downloads etc) in sidebar. Refer here.

  3. Icon theme in above image (papirus-icon-theme) doesn’t provide a symbolic icon equivalent to folder-torrent etc.

Even if [3] is available, it’s currently not possible due to [2].

Nautilus devs can clarify if [2] is planned / possible.

understood it.

While trying to find an answer before yours I was stumbled upon same issue 2.5 years back here.

I would be really nice it makes distinguishing bookmarks easier for eyes and makes experience better.

Thanks.

See issue: 1481