To open the material dialog box: Windows > materials
Generally, two types of materials (colors and textures) are available in the SketchUp dialog box and you can apply either one as per your need.
Solid colors are available in the dialog box and you cannot use the gradients. You can make the color of your choice.
Texture in SketchUp is a small image that is applied to the face of your design until the face gets completely covered by the image. For example, if you want to design a brick face, you need to click the brick icon image several times to fill up the surface. There are many textures available in SketchUp, and they indeed add an interesting touch to the design. If the already existed list seems not enough, you can download more from Google SketchUp website. You can also download paid textures and can make your own format.
• Textures have transparent areas also that allow you to see through the faces you are texturing on. The black spaces on the texture may look inappropriate, but they come up with a wide range of benefits.
• You can also edit a material as per your choice. This is basically the work of the advanced designers and they know how to handle the materials properly to make a perfect 3D model.