On the off chance that someone else wants this change, I've attached a couple of replacement images I whipped up for my install. Just remove the portion of code below from Gemma's, then upload the two gifs.
Code:
<span id="favlabel" onclick="dofav({vb:raw game.gameid})" style="cursor:pointer; text-decoration: underline">
<vb:if condition="$show['fav']">{vb:rawphrase sub_favorite}<vb:else />{vb:rawphrase add_favorite}</vb:if>
</span>