Simple minimalistic grub2 theme with customizable colors. No background included, just use your favorite one.
Use build.py script to create theme with given colors and background. New generated theme will be placed into crimson folder. Check build --help for more info.
WARNING: script doesn't verify input data and result. Check the theme with 'grub2-theme-preview' utility or some virtual machine to be safe.
Somehow console background theming doesn't work for me. Still console background image can be set directly by grub config, see custom.cfg.