code functionality is original from the author, I just tweaked the pretty symbols and packaged it up!
Here is one way to install it:
(url-copy-file "https://www.wisdomandwonder.com/wp-content/uploads/2012/09/pretty-mode-plus-1.0.tar" "/tmp/pretty-mode-plus-1.0.tar" t) (require 'package) (package-install-file "/tmp/pretty-mode-plus-1.0.tar")
Fixed the package definition and now it is on Marmalade here.
Added Jess mode support.