grub2-theme-catppuccin from home:smolsheep:catppuccin project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:smolsheep:catppuccin/openSUSE_Tumbleweed/home:smolsheep:catppuccin.repo zypper refresh zypper install grub2-theme-catppuccin