Silvia, a free WordPress theme for photography site by Theme-junkie is a basic WordPress theme. If you write posts with elegant photos, the theme will show that in 2 or 3 or 4 column grid layout on first page. You can also use Jetpack like plugin to embed photo galleries in an amazingly beautiful layout.
With the help of Jetpack plugin or other WordPress plugins, you can get lightbox effect as well on the gallery.
Silvia is available on WordPress.org portal. Compare Silvia with hundreds of other free and premium WordPress themes ar PurposeThemes http://pthe.me/1ME9jeE