FYI, I created all the "Tangy" themes. I basically got tired of all the colored themes having the same or similar dark color used on every single page element, and wanted something with slightly more differential design. TangyOrange was actually a request by Spazzo to get a theme working similarly to a certain board style from a theming site. I picked up on it and then suddenly decided to do a few more. TangyCitrus is currently my least favorite since some of the bright colors tend to have somewhat clashing hues. I may get around to tweaking it at some point. For the record, I currently use TangyApple.
I also created subSilver Original because I didn't like how the Silver Ocean theme had such an ugly navy blue color, along with a gray that was quite frankly too dark for a theme aiming to provide a light alternative to Ocean. It's basically the default settings for new themes created with the subSilver template, but with the header images removed for consistency.