Here they are:

Serif fonts.
Big Headings.
Multi Column Layouts.
Big Lead Image.
Diagrams and Infographics.
Minimalist and Grid Design.
One Page Layouts.
Massive White Space.
Typographic Layouts.
CSS3 Animation.
Rounded Corners.
Box and Text Shadows.
RGBa and Opactiy.
Mobile Compatible Design.
Clean Illustrations.
Textured Backgrounds.
Thumbnails.
Watercolor.
Handwriting.
Social Media.
Fixed Elements.

quite a list - learn more here. via smeidu