Shiny: Blender GLSL Materials

4.  Load image to use as reflective map

You can use any image as a reflective map.  For best results, try to match the colors of the reflective map to the game surroundings

Reflective maps can't be one solid color.  The brightness of the colors and the contrast between the colors determines how shiny it is.

Buttons Window menu >> Shading (F5) >> Texture buttons (F6)
Image tab

5.  Reflective map settings

Col slider:  (Strength of the reflection)
Range 0.0 to 1.0

Buttons Window menu >> Shading (F5) >> Material buttons
Select shiny texture
Map Input tab
Refl button
Map To tab
Col button
Texture blending mode:  Multiply
Col slider

6.  Start Game 

User Preference menu >> Game >> Start Game
P key