A child theme is the safest and easiest way to modify an existing theme, whether you want to make a few tiny changes or extensive changes.
Hi, BW WordPress theme just update the new version to 4.1. The update at Saturday (Dec 16, 2013) already aproved by WordPress theme reviewer (see http://themes.trac.wordpress.org/ticket/15284) and now the self-hosted WordPress users can download it free from the WordPress theme directory.
In this new version we have not much changes. It just fixed some style, especially the blockquote style. Removed some files that not use again, like color-option.php. Another fixed code was on header.php.
BW WordPress Theme update version 3.1 on Friday, Sepetember 27, 2013. In this update it added new some features like support HTML5, two BW widgets, new color scheme.
The first BW widget is Recent Posts by Format Widget. This widget shown any recent post which formatted with Aside, Image, Link, Quote, Status and Video format.