some useful links:
there are a few free 3d plant models in dxf and 3ds
format.http://www.newtek.com/freestuff/textures.html
free textures (high res )
requires some registration
frees imaging/editing software
requires registration
http://www.uvmapper.com/
prigram which maps obj files.
http://www.qfx.com/
requires some registation
there is a limites edition which is free.
http://www.geocities.com/SiliconValley/Ridge/7251/cyberop.htm
a free paint program
more will follow if i find them