Tympanus has a great tutorial on how to create a thumbnail grid with an expanding image preview similar to the effect seen on Google Images. In this article I show how the same can be implemented in Genesis to display featured images of posts on Posts page in a grid. Clicking on an image will reveal a bigger version of the image, post title, excerpt and a link to read the full post.
Screenshots:

When clicked:

Screencast:
Step 1
a) Upload modernizr.custom.js to child theme's js
directory.
b) Create a file named grid.js in the same location having the following code:
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