Hmm, I wonder if there's a site/utility where you input a theme and it converts it to everything else.

I second that. I'd like to give it a try in vim and see if I still like it after a day of use.

Unfortunately, I don't believe that an afterglow theme for vim exists yet, but if you want to try some different themes out, I'd recommend https://github.com/flazz/vim-colorschemes. My favorites are solarized, flatland, and codeschool. Solarized is likely the most advanced/complete vim colorscheme by looking at the solarized.vim.

They have an iterm2 theme https://github.com/YabataDesign/afterglow-itermcolors , gets you partway there (on a mac).

gruvbox theme for Vim is very similar.

https://github.com/morhetz/gruvbox