You can take any imported object (like the gems I linked to in the other thread) and export it from Bryce to 3ds or other format. To do this, launch Bryce and import the gem you want to export. With the gem (or other imported object, mesh, or terrain / lattice) highlighted, click the "E" box. Then, press Command-D (Ctrl-D for Windows) and export in the format of your choice to location of your choice.