Iridescence
This theme features a lot of customization options. It's quite in depth, a documentation folder can be downloaded with the theme to help better understand how it all works.
Fireworks
Fireworks - unlike my other themes, is quite standard when it comes to its customization options. It features more options than most themes while not being overwhelming.
Turbulence - Basic
This theme is a basic variant of the Advanced theme. It features less customization options making it less overwhelming than the Advanced theme.
Turbulence - Advanced
This theme features more options than the basic version of the Turbulence theme. The options could be overwhelming but to those who enjoy customizing their theme this has quite an array of options.