How to show a grid with a video (or a thumbnail) of latest post of each category.

Hi to everybody.

First, sorry for my waste english.

I have a big question, and i tried tolooking for the aswer in the forum, but i didn't found anything.

I want to display a grid (with four or five columns) where I show the latest post o each category.
'Cause every post starts with a video, I need the small video in the grid, or alternatively if isn't impossible to show video, a thumbnail with a link to the post...

I need the grid in the central column, below the loop.

I use ATA 3.4.5

Someone can help me???