Hi frozen ;)

I'd use a texture for the moss. If you're not doing some really close-up 
shots, you can certainly achieve a pretty realistic moss with a 
procedural texture (no need for an image map).

For the ivy - I've been playing around with some tree-generating 
algorithms limited to a plane (your wall). Although my results are not 
good enough (yet ;), I'd go and try that way.

HTH,
Florian
-- 
If a train station is a place where a train stops, what's a workstation?
[------------ http://www.torfbold.com - POV-Ray gallery ------------]

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