Because of copyright, most meshes and textures can't be redistributed or shared, even if they are free. You must get them from the maker. As a professor, I'd suggest searching freestuff here and at the other sites and then emailing the makers, asking permission to download for the class. Most people are generous and reasonable if asked. There are a few Native American props at 3dcommune (look for cooler: a variety from various tribes across the country) and at RDNA (look for Judith or TP... a loom, baskets, pottery... mostly southwest). If your students are using Bryce to make desert scenes, they will probably appreciate some desert-props such as tumbleweeds and cacti. Carolly