You can change the image the RSS sidebar widget uses by replacing the default rss.png image located here (this will also change the rss icon the admin area uses):
\wp-includes\images\rss.png
The image should be 14px by 14px
If you really do not want the image you can add this to your stylesheet:
.rsswidget img{
display:none;
}
Hope that helps.
.rsswidget img{
display:none;
}
That will actually still leave you with a 14px X14px orange square where the icon used to be ..
the best answer (to COMPLETELY REMOVE the RSS icon) is this:
Open wp-includes/widgets.php, find the following line and remove the BOLD text:
$title = "<strong><a class='rsswidget' href='$url' title='" . attribute_escape(__('Syndicate this content')) ."'><img style='background:orange;color:white;border:none;' width='14' height='14' src='$icon' alt='RSS' /></a></strong> <a class='rsswidget' href='$link' title='$desc'>$title</a>";
which will leave this:
$title = "<a class='rsswidget' href='$link' title='$desc'>$title</a>";
Save & upload.