based on the other samples i thought that i could get a custom icon for the facebook send button by adding an image tag within the a link tag. it works that way for addthis_button_facebook but not for addthis_button_facebook_send. same thing for addthis_button_twitter but not addthis_button_tweet.
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<div class="addthis_toolbox addthis_default_style addthis_32x32_style">
<a class="addthis_button_facebook_send"><img src="images/FaceBook-icon.png"/></a>
<a class="addthis_button_twitter"><img src="Twitter-icon.png"/></a>
<div class="tellafriendMore">
<label class="inline">More Options:</label>
<a class="addthis_button_compact"></a>
<a class="addthis_counter addthis_bubble_style"></a>
</div>
</div>
i'm working on a developmental site: http://dev.birthinganewwe.com/tellafriend/
Because the Facebook Send button is a third-party button you can't create a custom button for it.