Thierry has some bridges and rocks for ya'.
Thierry's Models (http://feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=8174.msg196067#msg196067)
Muser has a giant rock den with little spaces for ya'.
Muser's Meshes (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=19582.0)
Glave might have something you'd want.
Glave's Textures and Converted Meshes (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=11142.0)
She also has some particles.
Glave's Particles (http://feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=10942.0)
Galiou (or Tetsu) has a variety of nice bridges.
Galiou's Bridges & Meshes (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=18553.0)