Hi, this program was brought to my attention by a friend on another 3D board.
Read the site's FAQ, import an OBJ, twiddle the parameters and export an OBJ swathed in Ivy.
Might be good for garden features...
Care: It only uses OBJ, and polygon count may be HIGH.
I've not tried it yet, but looks like fun...
http://graphics.uni-konstanz.de/~luft/ivy_generator/