Tetris is a free responsive tumblog WordPress theme from WPExplorer. It comes with a masonry-like homepage and you can nicely showcase your posts using different WordPress post formats (included are gallery, standard, link, video, image post formats). Tetris can also be used as a portfolio theme.

Some of this theme’s features:

• 7 Post Formats: standard, gallery, audio, video, quote, link, image
• Featured homepage slider using “Soliloquy“
• Built-in theme options panel using Options Framework Plugin
• Responsive design
• Social options