Blender is a free and open-source 3D computer graphics software product used for creating animated films, visual effects, interactive 3D applications or video games. Blender’s features include 3D modeling, UV unwrapping, texturing, rigging and skinning, fluid and smoke simulation, particle simulation, animating, rendering, video editing and compositing.
 

sudo add-apt-repository ppa:cheleb/blender-svn
sudo apt-get update
sudo apt-get install blender

You can install blender via Ubuntu Software Center
Below is an example of Artwork made on Blender 2.60
UbuntuPirates Wallpaper by ~Reynante Martinez

Artist: Reynante Martinez

The UbuntuPirates wallpaper made on blender.
[singlepic id=60 w=1280 h=720 mode=web20 float=center]
[singlepic id=63 w=1920 h=1031 float=center]
Visit the official Site of Reynante Martinez for more artwork made on Blender