Eggs are easy.. when making the "new adoptable" give them all the same egg image.
For horizontal change article content of your adopt.php page at line 127 to
Code:
$article_content = $article_content."
<a href='adopt.php?id=".$aid."'><img src='".$eggimage."' border='0'></a> ";
Horizontal and no name or description like at http://mysticgrove.net/grove/adopt.php
Uploading I can't help you. :(