The thing is mostly what do you want to do. If you want to draw sketches you could do stuff for the MilleniumAD Mod. If you want to make scenarios you can work on the three mods cause we don't have yet good scenarios for mods. What do you need for texturing ? Applying them to 3D models is not that hard here is a tutorial I made not so long ago
If you want to model I can help you depending on what you need. There are a lot stuff to do for mods =) Bamboos are present. Unless you want to add it, I never seen it planned anywhere.