Using Genesis Featured Posts Combo plugin and Genesis Widget Areas Generator plugin I created this 3 columns grid layout for my blog posts. It took 5 mins.
Step 1: Created a widget area using Genesis Widget Areas Generator plugin. Navigate to Widget Generator > Add New and created this one
Add New Widget Area for Blog Page
Step 2: Drag&Drop the Genesis Featured Post Combo widget in “Grid Layout for Blog Page” widget area and setup the widget.
Step 3: Created a Blog page and assigned the “Grid Layout for Blog Page” widget area for that page. Also I entered this “grid-layout” in custom body class text field.