There is any solution to highlight the entire line where a mark has been inserted (e.g. with command
The best could be to have marked each mark with a different color of choice.
I created a plugin that I think does what you want.
If you want to change the colors that it uses simply define
g:highlightMarks_colors in your
vimrc as a list of colors (either names or RGB strings).
I welcome any feedback you have.
Screenshot as example: