XF 1.1 Thread Images

I was wondering if it was a way to use same images for posts when browsing a forum, as it is on the forum list.
Now we see the Avatar of the post author and a mini avatar from last replyed user.

How to change this to other images, one for new post in topic, and one for no new posts?

Tnx,, I have tried that one.
But that is not what I am looking for, i want one image for new post and one when there aint any new posts.
Like phpBB forums.