You might want to explore using vertex shaders to achieve some kind of
fake "geometry instancing". The SDK sample "osgforest" does something
similar to project a forest made of thousands of trees using GLSL (and
also ARB fragment program in the 2.9 branch).

More about OpenGL pseudo instancing is found here in this nVidia paper:
http://download.nvidia.com/developer/SDK/Individual_Samples/DEMOS/OpenGL/src/glsl_pseudo_instancing/docs/glsl_pseudo_instancing.pdf

Christian
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