Bearded is a top free responsive WordPress theme for portfolios and apps. You can also set it up to look like a simple blogging theme and it supports a wide range of post formats.
This theme has some layout and color options built into the Theme Customizer. It means that you can not only change the way it looks, but you can do it in real time before applying your changes to the actual site. It also has a handy drag and drop widget for the homepage layout.
Bearded theme supports the Custom Content Portfolio plugin, giving the artists and other creative people the ability to share their work hassle free.