Maybe you could use Tetsu's bridges (that seem broken or whatever) as an eerie theme.
Image
<
Download (http://www.mediafire.com/?ht2atxycx8jcgg5)>
I'll just give you the link to Testu's thread (even if you've already checked or not), since there might be some good eerie things there.
<
Click me (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=18553.msg247421#msg247421)>
I think this one has a zombie dragon and some goblins in it?
<Download (http://www.mediafire.com/?74es70b7apgf190)>
Try Glave's thread. She might have some good meshes for your theme, hopefully.
http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=11142.msg154105#msg154105 (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=11142.msg154105#msg154105)
And Glave's particles:
http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=10942.msg151226#msg151226 (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=10942.msg151226#msg151226)
Sorry if these weren't helpful. I'll try and find more soon. Good luck with finding the right objects for your map! :p
This is all I could find:
http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=19582.0 (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=19582.0)
Muser has some cool plants that would look nice. They'd look nice in a fantasy map or something like that. lol
If I find anymore I'll post here. ^^