This is a plymouth screen i made for Garuda Linux.
Download the linesma-wp-sgs-plymouth-screen.tar.gz file and open a terminal window (press Ctrl+Alt+T) and copy+paste the commands below to unpack and move the grub theme to the right location.
cd ~/Downloads
tar -xvzf linesma-wp-sgs-plymouth-screen.tar.gz
cd linesma-wp-sgs-plymouth-screen/plymouth/
sudo cp -r linesma-wp-sgs/ /usr/share/plymouth/themes/
You can change the plymouth theme using the Garuda Boot Options menu.