A powerful multimedia theme for the static site generator jekyll. Jekyll allows for complex static websites, that do not require databases. The advantages are: highly secure websites (harder to hack), speed (very good for SEO) and highly customizable. Jekyll uses markdown and is easy to use.
Gridster is in material design, comes with 5 layout options for each type (post, page, index) and has multiple post type support (Audio, Video, Image, Gallery (2 options) and standard).