I get a lot of phone calls from people who are interested in drawing objects in 3D so that they can use them in their Civil 3D models. I ask what kind of objects that they in need of. The answers are usually of signs, trees, and other items of the sort.
The content folders of AutoCAD Civil 3D contain a large number of predefined multi-view blocks for a number of design purposes. You can access these multi-view blocks from the AutoCAD Civil 3D MV Blocks Tool Palette. Simply launch your tool palettes and right-click on the sidebar and you'll see the option:
The multi-view blocks included are of highway furniture, city furniture (external works tab), landscape items, and building footprints:
You can also use DesignCenter™ to insert the blocks.
Predefined multi-view blocks are located in the following folder by default:
Windows 7: \Program DataAutodeskC3D 2013enuDataSymbolsMvblocks
Windows XP: \Documents and SettingsAll UsersApplication DataAutodeskC3D 2013enudataSymbolsMvblocks