Great idea! I'm going to be with you mentally but do the work at home, Europe.

It would be nice to have a simple online tool that would add those vim keyboard shortcuts to any image. I don't want to change my wallpaper.

There's a transparent png file in the source files that I've got out on bitbucket (https://bitbucket.org/tednaleid/vim-shortcut-wallpaper/src/t..., the white letters don't show up on bitbucket's white background), you can take that file and overlay it on top of another image in pretty much any image editor easily.