I don’t know much vim, but emacs has themes and I’m sure that vim does too.

kagis

I dunno if this is what vimfolk use these days, but:

https://vimcolorschemes.com/i/trending

EDIT: Here are two “blue background” themes:

https://vimcolorschemes.com/lmintmate/blue-mood-vim

https://vimcolorschemes.com/vim-scripts/blue.vim

EDIT2: And some emacs themes – vim themes look to be a lot simpler than these:

https://emacsthemes.com/

including a clone of the Borland C that I guess the author likes:

https://emacsthemes.com/themes/borland-blue-theme.html

EDIT3: Here’s a Borland C color scheme for vim:

https://github.com/letorbi/vim-colors-modern-borland

Does solarized count as blue colors?