One weekend I was reading an article howto made a Vim syntax file. In application I decided to make one for the Swift workflow system. Most of the script contains simple word matches for some Swift keywords. Then I copied the matching rules for comments from the C syntax files in the standard Vim distribution. For a preview, checkout the screenshot below which uses the desert256.vim colorscheme in a gnome-terminal:
The syntax file can be downloaded from my graduate student code-shanty page.