How to assign an image to a post template + styling post templates

Hi,

I would like to know how to assign an image to a newly created post template. There are four default post templates (blank, for news, for event and for videos) and each of them has an image set as a style. Each newly created post is a blank rectangle - just with solid 1px border.

I would like to assign images to my newly created post. Please advice how to do it. I tried to achieve this through css, e.g.

div#fd.eb .template-thumb element.style{

	background-image:url(../../../images/image.png)!important;

but I got no results.

Additionally I would like to style the new templates with css, is this possible? Is it possible to style template by adding specific styles at all?

Thanks for help