Actually there are tons of Pinterest clones and Themes available on Internet,In this list I have mentioned some of the best Free WordPress themes which will give you the Pinterest feel.
Note that these WordPressThemes are very useful for building Portfolio and Gallery websites.
The Post – Minimal WordPress Theme
iPin – WordPress Pinterest Clone
Grid Theme – Responsive WordPress Theme
Gridly Theme – Responsive WordPress Theme
Vibe Awesome Responsive WordPress Theme
Pronto Free Masonry Gallery WordPress Theme
Paragrams WordPress Theme
Themolio WordPress Theme
Hope you enjoyed this list,please feel free to share this to your social circles.I might have missed some other good WordPress themes,If so please let me know it through your comments.