I thought I'd found this through a link here; but after searching the forums for whom to thank, it seem that I did not.

So,... http://graphics.uni-konstanz.de/~luft/ivy_generator/

It is a very nice addition to the 3D toolkit.
This application actually grows an Ivy plant on a obj mesh.
(Beware: resulting meshes can be very LARGE; but by careful adjustment of certain parameters, this can be controlled.)

{I had to invert one of the transmaps; but it was a simple thing to do.)

Here's a quick example:

     Looks great, thanks   

Yes   !! This is really an interesting thing       !

I see. I'm happy you're amused. You don't say.