I have a free theme in the marketplace called 'FlexCRETE'. It is very minimal in its appearance, BUT it is a responsive theme that works perfectly. Here is a link to the theme.

http://www.concrete5.org/marketplace/themes/flexcrete/...

I am very close to releasing version 2.0, which I intend to start charging $15 for at the beginning of February. The reason I have decided to do this is because I need financial support so I can provide quality support for it.

I am looking for some feedback as to what add value to it so that it's worth $15 in the marketplace. Thanks!