Try putting:
p img {
margin: 5px;
padding: 10px;
border: solid black 1px;
}
img.wp-smiley {
border:none;
}
into your css file.
That way you don’t have to modify anything but the css file. I hope you don’t have a lot ot p’s in the sidebar and such ??
However there should be, for the niceness of look-changing, be a div wrapped around your posts, so if you know a little html you can put
<div class="post">
post tags come here
</div>
around your post and then style it in the css file with:
div.post img {
margin: 5px;
padding: 10px;
border: solid black 1px;
}
img.wp-smiley {
border:none;
}
Good luck.