Michal Kotek has released a collection of plant textures suitable for architectural visualization. It includes 17 trees, 4 shrubs, and 2 plant textures all in TIF format and JPG diffuse and opacity maps.
Randall Hand
Randall Hand is a computer graphics programmer and news junky that's been working in the field for the last 15 years. He's responsible for visualizations generated on some of the most powerful supercomputers in the world, ytnef, mullion support in ParaView, and VizWorld.com.