Avatar Size In Recent Block

[kh99]

I don't have a block_recentpost template - do you mean block_newposts? (Is it a block or a cms widget?).

You could try this: edit the additional.css template and add this:

.block .widget_post_useravatar img {
    height: auto;
    max-width: 30px !important;
    width: 30px;
}

and change the width and max width to whatever you want.