Texturing the Ramps
Once the ramps are placed in a scene, you can begin to texture them. The SDK Project has some Standard Material textures already supplied in Assets\Textures, but feel free to add your own!
First, right click on a ramp prefab and enable Editable Children 
Then find a StanardMaterial.tres you like, Example: Assets\Textures\Bricks098\Bricks098.tres Drag the Material onto the ramp where you enabled editable children 