Unity Technologies, the company that makes Unity and owns the Asset Store, has a robust VR Samples asset package. It contains a menu and four mini-games that can be used to help you get started in creating virtual reality games for Oculus DK2 and GearVR. 

Here are the basics included in the asset package:

• Floating World-Space GUI
• Static World-Space GUI
• Flyer
• Maze
• Shooter

As you would expect, all the related shaders, audio, fonts, materials, textures, animations, controllers, mixers, meshes, models, prefabs, scenes, and scripts are included.