In order to benefit from security-updates from the standard WordPress Themes I have chosen Twenty Twelve and Twenty Fourteen Themes as a "foundation" for these Child Themes.
These got adjusted and extended to fit my needs. During this Process not merely appearance was important, but rather the privacy of the users.
White is based on Twenty Fourteen and
Grey + JustText are based on Twenty Twelve.
Why did I initiate these Child Themes...
To avoid this and nonetheless get security-updates, I created Child Themes based on Twenty Twelve and Twenty Fourteen.
These Child Themes use "Open-Sans"-font which is self-hosted and their "Share-Buttons" only send data to social networks if they are clicked on.