I really like your Soda Dark theme. I of course like to tweak thing so might I suggest that you move the Theme - Soda folder out of the User folder and place in in the main Packages folder. This way a user could create a Soda Dark.sublime-theme file in their User folder to allow overriding some of the setting without needing to changing the original file. This was what I was doing with the Default theme.
Another option would be to move all themes into a Packages/Themes folder and that would contain all themes where the *.sublime-theme files would be in the Themes folder and all graphics would be in the Theme_Name folders, i.e. Default, Soda Dark\ etc. One of the drawbacks I see with the approach is version control of separate theme packages would be difficult.
Dan