Install this package:
emerge -a x11-themes/faenza-icon-theme
If the package is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask
emerge
autounmask x11-themes/faenza-icon-theme
Or alternatively:
emerge --autounmask-write -a x11-themes/faenza-icon-theme
<pkgmetadata> <upstream> <remote-id type="google-code">faenza-icon-theme</remote-id> </upstream> </pkgmetadata>